Slide and merge to grow your tiles, but every merge stokes the heat, and a twice-burned tile is a ticking bomb.
Overheat is a sliding number-merge puzzle with a heat economy bolted on. Slide the whole board so equal tiles combine into a bigger number, exactly like the classic powers-of-two puzzle. But each merge raises a tile's heat, and once a tile has merged twice it ignites with a short fuse. Merge an ignited tile again to vent the heat; let the fuse run out and the cell burns to permanent slag, shrinking your usable board.
Sliding tiles so equal values combine into a bigger number is 2048 exactly.
The original layer is thermal: each merge heats a tile, a tile that has merged twice ignites with a short fuse, and merging an ignited tile again vents the heat.
That makes the parent game's core action self-limiting. In 2048 merging is unambiguously good and the only question is order; here a chain of merges on the same tile is how you lose the board, so greed has a cost measured in holes.
Overheat reimagines the sliding number-merge puzzle by turning runaway merges into a heat-management gamble, where greed literally burns holes in your board. It is an original, free browser game built in-house for PlayPendium.