The painting buffer creation code was duplicated at lines 520-749, containing the old implementation with plot() calls that don't exist in the painting API. This orphaned code was left behind from incomplete refactoring and prevented the file from being syntactically valid. Removed the duplicate entirely, leaving only the corrected implementation (lines 308-519) with proper box(x,y,1,1) calls for pixel drawing. - Removed 230 lines of orphaned/duplicate code - File now passes syntax validation: node -c arena.mjs ✓ - All 8 button buffers (jump_normal/active, crouch_normal/active, up/down/left/right) properly created with painting API methods - Button rendering via paste() in paint callbacks now works correctly Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>