Swipe/arrows/WASD merge and spawn on3×3. The outlined center must reach64. Stoke left+right or above+below when both fuel ranks equal half the center:4 with2+2 makes8, clears both fuels, no spawn. Undo restores a slide or stoke. R restarts; Tab/Enter supported.

Original compact interpretation; scenario rules and goals differ from the inspiration. No copied assets. See source notes and complete QA replay sequences.