diff --git a/crates/horizon-client/src/game/commands.rs b/crates/horizon-client/src/game/commands.rs
index ff4d2c3a45..a581da0c72 100644
--- a/crates/horizon-client/src/game/commands.rs
+++ b/crates/horizon-client/src/game/commands.rs
@@ -14,6 +14,7 @@ mod players;
 pub(super) mod pregen;
 mod profiles;
 mod raid;
+mod selector_bounds;
 mod terrain_cmds;
 mod test_locate;
 mod test_runs;
@@ -880,14 +881,21 @@ impl Game<'_> {
                 }
                 if s.delta.iter().any(Option::is_some) {
                     let d = s.delta.map(|v| v.unwrap_or(0.0));
-                    for i in 0..3 {
-                        let (a, b) = (
-                            origin[i].min(origin[i] + d[i]),
-                            origin[i].max(origin[i] + d[i]) + 1.0,
-                        );
-                        if p[i] < a || p[i] >= b {
+                    if let Some(bounds) = self.selector_target_bounds(t) {
+                        if !selector_bounds::selector_box(origin, d).intersects(bounds) {
                             return None;
                         }
+                    } else {
+                        // Unmodeled boxes retain their previous point fallback.
+                        for i in 0..3 {
+                            let (a, b) = (
+                                origin[i].min(origin[i] + d[i]),
+                                origin[i].max(origin[i] + d[i]) + 1.0,
+                            );
+                            if p[i] < a || p[i] >= b {
+                                return None;
+                            }
+                        }
                     }
                 }
                 Some((t, d2))
@@ -4400,3 +4408,91 @@ mod teleport_rider_tests {
         assert_eq!(rider.position, Vec3::new(0.0, 64.0, 0.0));
     }
 }
+
+#[cfg(test)]
+mod selector_bounds_tests {
+    use super::*;
+    use crate::game::{Audio, Options, Progress, Settings, load_resources};
+    use horizon_client::{entities::ArmorStand, mobs::Mob};
+    use horizon_core::geometry::Vec3;
+
+    #[test]
+    fn actual_selector_uses_body_overlap_but_distance_stays_at_the_origin() {
+        let root = std::path::Path::new(env!("CARGO_MANIFEST_DIR"))
+            .join("../../.local/horizon-client")
+            .join(horizon_core::VANILLA_VERSION);
+        if !root.join("entity-types.json").exists() {
+            eprintln!("Prepared resources unavailable; Game selector coverage did not run");
+            return;
+        }
+        let settings = Settings::default();
+        let loaded = load_resources(
+            root.clone(),
+            None,
+            &root,
+            &settings,
+            std::time::Instant::now(),
+            false,
+            true,
+            &Progress::new(),
+            &mut |_, _| unreachable!(),
+        )
+        .unwrap();
+        let mut options = Options::parse(std::iter::empty()).unwrap().unwrap();
+        options.resources = root.clone();
+        options.execution_role = crate::game::execution_role::ExecutionRole::IntegratedServer;
+        let mut game = Game::new(
+            &loaded.resources,
+            loaded.pack,
+            loaded.gui.unwrap(),
+            options,
+            settings,
+            Audio::silent(&root),
+            None,
+        )
+        .unwrap();
+        game.build_registries();
+        let kind = game.res.mob_types().get("minecraft:pig").unwrap().clone();
+        game.mobs
+            .push(Mob::new(30, kind, Vec3::new(10.5, 220.0, 10.5), 0.0));
+        let target = Target::Mob(30);
+        let mut selector = Selector {
+            kind: 'e',
+            include_entities: true,
+            limit: usize::MAX,
+            delta: [Some(0.0); 3],
+            ..Default::default()
+        };
+        let origin = [9.5, 220.0, 10.5];
+        assert_eq!(
+            game.select_in_level(vec![target], &selector, origin),
+            vec![(target, 1.0)]
+        );
+        selector.distance = Some((None, Some(0.9)));
+        assert!(
+            game.select_in_level(vec![target], &selector, origin)
+                .is_empty()
+        );
+        selector.distance = None;
+        assert!(
+            game.select_in_level(vec![target], &selector, [11.0, 220.0, 10.5])
+                .is_empty()
+        );
+        selector.delta = [Some(-1.0), None, None];
+        assert_eq!(
+            game.select_in_level(vec![target], &selector, [11.5, 220.0, 10.5])
+                .len(),
+            1
+        );
+        game.armor_stands
+            .push(ArmorStand::new(31, Vec3::new(30.5, 220.0, 10.5), 0.0));
+        selector.delta = [Some(0.0); 3];
+        for (x, count) in [(29.5, 1), (29.25, 0), (30.75, 0), (29.250000000000004, 1)] {
+            assert_eq!(
+                game.select_in_level(vec![Target::Stand(31)], &selector, [x, 220.0, 10.5])
+                    .len(),
+                count
+            );
+        }
+    }
+}
diff --git a/crates/horizon-client/src/game/commands/selector_bounds.rs b/crates/horizon-client/src/game/commands/selector_bounds.rs
new file mode 100644
index 0000000000..1be4dcc700
--- /dev/null
+++ b/crates/horizon-client/src/game/commands/selector_bounds.rs
@@ -0,0 +1,75 @@
+//! The physical bounds already kept for selector targets. This is not a
+//! rendered box or a new source of entity dimensions.
+use super::{Game, Target};
+use crate::game::entity::Entity;
+use horizon_core::geometry::{Aabb, Vec3};
+
+fn extents((lo, hi): ([f64; 3], [f64; 3])) -> Aabb {
+    Aabb::new(
+        Vec3::new(lo[0], lo[1], lo[2]),
+        Vec3::new(hi[0], hi[1], hi[2]),
+    )
+}
+
+/// `EntitySelectorParser.createAabb`, moved by the selector origin.
+pub(super) fn selector_box(origin: [f64; 3], delta: [f64; 3]) -> Aabb {
+    let lo = std::array::from_fn(|i| origin[i] + delta[i].min(0.0));
+    let hi = std::array::from_fn(|i| origin[i] + (delta[i].max(0.0) + 1.0));
+    extents((lo, hi))
+}
+
+impl Game<'_> {
+    /// `Entity.getBoundingBox`: use each simulated kind's existing physical
+    /// box. None means no authoritative box is modeled here yet; the selector
+    /// retains its existing point fallback for those kinds.
+    pub(super) fn selector_target_bounds(&self, target: Target) -> Option<Aabb> {
+        match target {
+            Target::Player => self.player.as_ref().map(|p| p.bounds()),
+            Target::Guest(conn) => self.command_guest(conn).map(|p| p.bounds()),
+            Target::Mob(id) => self.mobs.iter().find(|e| e.id == id).map(Entity::bounds),
+            Target::Item(id) => self.dropped.iter().find(|e| e.id == id).map(Entity::bounds),
+            Target::Orb(id) => self.orbs.iter().find(|e| e.id == id).map(Entity::bounds),
+            Target::Projectile(id) => self
+                .creatures
+                .projectiles
+                .iter()
+                .find(|e| e.id == id)
+                .map(Entity::bounds),
+            Target::Stand(id) => self
+                .armor_stands
+                .iter()
+                .find(|e| e.id == id)
+                .map(Entity::bounds),
+            Target::Boat(id) => self.boats.iter().find(|e| e.id == id).map(Entity::bounds),
+            Target::Cart(id) => self.carts.iter().find(|e| e.id == id).map(Entity::bounds),
+            Target::Tnt(id) => self.tnts.iter().find(|e| e.id == id).map(Entity::bounds),
+            Target::Falling(id) => self.falling.iter().find(|e| e.id == id).map(Entity::bounds),
+            Target::Rocket(id) => self.rockets.iter().find(|e| e.id == id).map(Entity::bounds),
+            Target::Trident(id) => self
+                .tridents
+                .iter()
+                .find(|e| e.id == id)
+                .map(Entity::bounds),
+            Target::Frame(id) => self
+                .item_frames
+                .iter()
+                .find(|e| e.id == id)
+                .map(|e| extents(e.bounds())),
+            Target::Painting(id) => self
+                .paintings
+                .iter()
+                .find(|e| e.id == id)
+                .map(|e| extents(e.bounds())),
+            Target::Crystal(id) => self
+                .crystals
+                .iter()
+                .find(|e| e.id == id)
+                .map(|e| e.bounds()),
+            Target::Other(_)
+            | Target::Fangs(_)
+            | Target::Dragon(_)
+            | Target::Spawner(_)
+            | Target::Cloud(_) => None,
+        }
+    }
+}
diff --git a/tools/selector_bounds_corpus.py b/tools/selector_bounds_corpus.py
new file mode 100644
index 0000000000..fb89209537
--- /dev/null
+++ b/tools/selector_bounds_corpus.py
@@ -0,0 +1,106 @@
+"""Strict zero-tick box selection versus independent point distance/sorting."""
+from command_exec_corpus import cmd
+
+
+def selector_bounds():
+    ops = []
+
+    def run(text, expected=None, label=None, record=True):
+        op = cmd(text, record=record, expect_result=expected)
+        if label:
+            op['label'] = label
+        ops.append(op)
+
+    run('/tick freeze', 1)
+    run('/gamerule spawn_mobs false')
+    run('/gamerule advance_time false')
+    run('/forceload add 0 0 63 31', 8)
+    ops.append({'op': 'settle', 'required_chunks': [[x, z] for x in range(4) for z in range(2)]})
+    for x in range(4):
+        for z in range(2):
+            run(f'/execute if loaded {x*16} 220 {z*16}', 1)
+    run('/fill 0 219 0 63 219 31 minecraft:stone', 2048)
+    run('/fill 0 220 0 63 224 31 minecraft:air')
+    for x in [10, 20, 30, 40, 50]:
+        run(f'/execute if block {x} 219 10 minecraft:stone', 1)
+    run('/execute if block 10 220 10 minecraft:air', 1)
+    run('/tp @s 0.5 220 0.5')
+    run('/gamemode creative')
+    run('/execute if entity @s[type=minecraft:player,gamemode=creative,nbt={Health:20f,Pos:[0.5d,220d,0.5d]}]', 1)
+    run('/data get entity @s UUID', 4)
+    run('/kill @e[type=!player]', record=False)
+    run('/scoreboard objectives add h030 dummy', 1)
+    run('/execute store result score start h030 run time query gametime', record=False)
+    actors = [
+        ('pig', 'pig', 10.5, 'Health:10f,NoAI:1b,', 'Health:10f,NoAI:1b,'),
+        ('golem', 'iron_golem', 20.5, 'Health:100f,NoAI:1b,', 'Health:100f,NoAI:1b,'),
+        ('stand', 'armor_stand', 30.5, 'Health:20f,', 'Health:20f,'),
+        ('item', 'item', 40.5, 'Health:5s,PickupDelay:32767s,Item:{id:"minecraft:stone",count:3},', 'Health:5s,Item:{id:"minecraft:stone",count:3},'),
+        ('boat', 'oak_boat', 50.5, '', ''),
+        ('far_pig', 'pig', 12.5, 'Health:10f,NoAI:1b,', 'Health:10f,NoAI:1b,'),
+    ]
+    for n, (name, kind, x, extra, guard) in enumerate(actors, 1):
+        tags = f'"h030_{name}"' + (',"h030_pigs"' if kind == 'pig' else '')
+        run(f'/summon minecraft:{kind} {x} 220 10.5 {{UUID:[I;30,0,0,{n}],Tags:[{tags}],{extra}NoGravity:1b}}', 1)
+        run(f'/execute if entity @e[type=minecraft:{kind},tag=h030_{name},nbt={{UUID:[I;30,0,0,{n}],{guard}NoGravity:1b,Pos:[{x}d,220d,10.5d]}}]', 1)
+        run(f'/data get entity 0000001e-0000-0000-0000-{n:012x} UUID', 4)
+        run(f'/data get entity 0000001e-0000-0000-0000-{n:012x} Pos')
+    checks = [
+        ('pig-overlap-x', '9.5 220 10.5', 'tag=h030_pig,dx=0,dy=0,dz=0', 1),
+        ('pig-separated-x', '11 220 10.5', 'tag=h030_pig,dx=0,dy=0,dz=0', 0),
+        ('pig-point-distance', '9.5 220 10.5', 'tag=h030_pig,dx=0,dy=0,dz=0,distance=..0.9', 0),
+        ('pig-distance-one', '9.5 220 10.5', 'tag=h030_pig,dx=0,dy=0,dz=0,distance=..1', 1),
+        ('pig-overlap-z', '10.5 220 9.5', 'tag=h030_pig,dz=0', 1),
+        ('pig-positive-x', '8.5 220 10.5', 'tag=h030_pig,dx=1', 1),
+        ('pig-negative-x', '11.5 220 10.5', 'tag=h030_pig,dx=-1', 1),
+        ('pig-positive-z', '10.5 220 8.5', 'tag=h030_pig,dz=1', 1),
+        ('pig-negative-z', '10.5 220 11.5', 'tag=h030_pig,dz=-1', 1),
+        ('pig-positive-y', '10.5 218.5 10.5', 'tag=h030_pig,dy=1', 1),
+        ('pig-negative-y', '10.5 221.5 10.5', 'tag=h030_pig,dy=-1', 1),
+        ('pig-bottom-touch', '10.5 219 10.5', 'tag=h030_pig,dy=0', 0),
+        ('pig-top-touch', '10.5 220.89999997615814 10.5', 'tag=h030_pig,dy=0', 0),
+        ('pig-type-positive', '9.5 220 10.5', 'tag=h030_pig,type=minecraft:pig,dx=0', 1),
+        ('pig-type-negative', '9.5 220 10.5', 'tag=h030_pig,type=!minecraft:pig,dx=0', 0),
+        ('pig-type-other-negative', '9.5 220 10.5', 'tag=h030_pig,type=!minecraft:cow,dx=0,limit=1', 1),
+        ('golem-wide', '19 220 10.5', 'tag=h030_golem,dx=0', 1),
+        ('golem-tall', '20.5 222 10.5', 'tag=h030_golem,dy=0', 1),
+        ('golem-separated', '22 220 10.5', 'tag=h030_golem,dx=0', 0),
+        ('stand-overlap', '29.5 220 10.5', 'tag=h030_stand,dx=0', 1),
+        ('stand-left-touch', '29.25 220 10.5', 'tag=h030_stand,dx=0', 0),
+        ('stand-right-touch', '30.75 220 10.5', 'tag=h030_stand,dx=0', 0),
+        ('stand-left-inside', '29.250000000000004 220 10.5', 'tag=h030_stand,dx=0', 1),
+        ('stand-tall', '30.5 221.5 10.5', 'tag=h030_stand,dy=0', 1),
+        ('item-overlap', '39.5 220 10.5', 'tag=h030_item,dx=0', 1),
+        ('item-left-touch', '39.375 220 10.5', 'tag=h030_item,dx=0', 0),
+        ('item-right-touch', '40.625 220 10.5', 'tag=h030_item,dx=0', 0),
+        ('item-front-touch', '40.5 220 9.375', 'tag=h030_item,dz=0', 0),
+        ('item-back-touch', '40.5 220 10.625', 'tag=h030_item,dz=0', 0),
+        ('item-top-touch', '40.5 220.25 10.5', 'tag=h030_item,dy=0', 0),
+        ('boat-overlap', '49 220 10.5', 'tag=h030_boat,dx=0', 1),
+        ('boat-left-touch', '48.8125 220 10.5', 'tag=h030_boat,dx=0', 0),
+        ('boat-right-touch', '51.1875 220 10.5', 'tag=h030_boat,dx=0', 0),
+        ('pigs-both', '9.5 220 10.5', 'tag=h030_pigs,dx=3', 2),
+        ('pigs-limit', '9.5 220 10.5', 'tag=h030_pigs,dx=3,limit=1', 1),
+    ]
+    for label, origin, options, expected in checks:
+        run('/scoreboard players set result h030 -99', -99)
+        run('/scoreboard players set success h030 -99', -99)
+        run('/scoreboard players get result h030', -99)
+        run('/scoreboard players get success h030', -99)
+        run(f'/execute positioned {origin} store result score result h030 store success score success h030 run execute if entity @e[{options}]', expected, label)
+        if expected == 0:
+            ops[-1].pop('expect_result')
+            ops[-1]['expect_callback'] = [False, 0]
+        run('/scoreboard players get result h030', expected)
+        run('/scoreboard players get success h030', int(expected > 0))
+    for sort, tag in [('nearest', 'pig'), ('furthest', 'far_pig')]:
+        run(f'/execute positioned 9.5 220 10.5 as @e[tag=h030_pigs,dx=3,sort={sort},limit=1] if entity @s[tag=h030_{tag}]', 1, 'point-sort-' + sort)
+        run(f'/execute positioned 9.5 220 10.5 as @e[tag=h030_pigs,distance=..4,sort={sort},limit=1] if entity @s[tag=h030_{tag}]', 1, 'unboxed-point-sort-' + sort)
+    for n, (name, kind, x, _, guard) in enumerate(actors, 1):
+        run(f'/execute if entity @e[type=minecraft:{kind},tag=h030_{name},nbt={{UUID:[I;30,0,0,{n}],{guard}NoGravity:1b,Pos:[{x}d,220d,10.5d]}}]', 1)
+        run(f'/data get entity 0000001e-0000-0000-0000-{n:012x} Pos')
+    run('/execute store result score end h030 run time query gametime', record=False)
+    run('/scoreboard players operation end h030 -= start h030', record=False)
+    run('/scoreboard players get end h030', 0, 'zero-world-ticks')
+    run('/execute if entity @s[type=minecraft:player,gamemode=creative,nbt={Health:20f,Pos:[0.5d,220d,0.5d]}]', 1)
+    return ops
diff --git a/tools/test_command_exec_parity.py b/tools/test_command_exec_parity.py
index 2263ed8027..3aa7a2e06a 100644
--- a/tools/test_command_exec_parity.py
+++ b/tools/test_command_exec_parity.py
@@ -128,6 +128,7 @@ def main():
     parser.add_argument("--pufferfish-mob-fixture", action="store_true")
     parser.add_argument("--pufferfish-mob-duration-diagnostic", action="store_true")
     parser.add_argument("--pufferfish-mob-overlap-control", action="store_true")
+    parser.add_argument("--selector-bounds-fixture", action="store_true")
     args = parser.parse_args()
     build = args.work_dir.resolve() if args.work_dir else lab.LOCAL / 'command-exec-parity'
     build.mkdir(parents=True, exist_ok=True)
@@ -250,6 +251,9 @@ def main():
         parser.error('reinforcement fixtures require --only with one exact group')
     if any(name in isolated_recipes for name, _ in groups) and sum(name != 'setup' for name, _ in groups) != 1:
         parser.error('crafting recipe fixtures require --only with one exact group')
+    if args.selector_bounds_fixture:
+        from selector_bounds_corpus import selector_bounds
+        groups = [("setup", corpus_module.group_setup()), ("selector entity bounds", selector_bounds())]
     script = []
     for _, lines in groups:
         script.extend(lines)
diff --git a/tools/test_selector_bounds_parity.py b/tools/test_selector_bounds_parity.py
new file mode 100644
index 0000000000..352d982e3b
--- /dev/null
+++ b/tools/test_selector_bounds_parity.py
@@ -0,0 +1,26 @@
+#!/usr/bin/env python3
+"""Box selectors through actual Game entity bounds; point distance and sort controls."""
+import argparse
+from pathlib import Path
+import subprocess
+import sys
+
+
+def main():
+    parser = argparse.ArgumentParser(description=__doc__)
+    parser.add_argument('--binary', type=Path)
+    parser.add_argument('--reference-only', action='store_true')
+    parser.add_argument('--work-dir', type=Path)
+    args = parser.parse_args()
+    root = Path(__file__).resolve().parents[1]
+    command = [sys.executable, str(root / 'tools/test_command_exec_parity.py'), '--selector-bounds-fixture',
+               '--work-dir', str(args.work_dir.resolve() if args.work_dir else root / '.local/selector-bounds-parity')]
+    if args.binary:
+        command += ['--binary', str(args.binary.resolve())]
+    if args.reference_only:
+        command.append('--reference-only')
+    return subprocess.run(command, cwd=root).returncode
+
+
+if __name__ == '__main__':
+    sys.exit(main())