A collider filled its area with a faint green in the scene view all the time. It lay over every sprite a collider sits on and made the art look washed out. The outline alone shows where a collider is. The area only matters while one works on that collider. - drawItem takes a selected flag. Only a selected collider is filled, every other one is drawn as its outline. - The fill is stronger than before, alpha 0.3 instead of 0.12, so the selected area is easy to see. The value is COLLIDER_FILL_ALPHA in src/viewport/symbols.ts. - The scene view says what is selected through isSelected. The game view keeps the default and never fills. - Only the collider object itself counts. Selecting its body leaves the area unfilled. Tests: - 2 new unit tests in tests/viewport/collider-color.test.ts read the Pixi instructions: outline only when not selected, fill at 0.3 and outline when selected. - Counter check: with the fill drawn regardless of selection the outline-only test fails. The original is back per cmp. - ./check.sh: 158 files, 2334 tests, CHECK EXIT 0. - e2e 1-17,28-30: no FAIL. e2e 39-43: ALL PASSED, 145 checks. A first run left out 39, which 40 builds on, and failed 8 checks in 40 for the missing tile only. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>