Level Slice is an authored gameplay lab at @shared/scenes/level_slice.scene.yaml. It exercises navigation, interaction puzzles, inventory, checkpoints, mission/progression state, scene exit, and reload/restart behavior through the shared scene-play framework.

Use BulletSketch Play in Viewport for in-editor preview or Run Standalone for the external generic scene runner. Level Slice has no dedicated application wrapper and no runtime bundle.

Automated proof includes:

• session_level_slice_navigation_tests;
• session_level_slice_interaction_puzzle_tests;
• session_level_slice_inventory_checkpoint_tests;
• session_level_slice_exit_progression_tests;
• focused level-controller and runtime-host progression coverage; and
• editor_standalone_level_slice_runner_tests for the generic-runner workflow.

The scene and its dependencies live in the full shared workspace depot. They are not part of the extracted editor bundle's narrow runtime-core asset subset.