Fusefall Foundry

Time two mining charges around a six-bar casting order. Recover all four ore rocks and cast three rows without wasting metal in a blast. Select a charge or bar, aim, then Place. A charge can sit on ore, and detonates after two successful bar placements. Blasts clear their cell plus orthogonal neighbors, recovering ore but destroying metal. Charges do not tick other charges. Full metal rows are cast after blasts, without gravity. Every three rows alone is insufficient: all four ore rocks are required too. Undo restores fuse timers and stock.