Forget alternating colours, here cards bond by magnetic polarity, and same poles push apart.
Move every card to the four foundations. Cards only stack where opposite magnetic poles attract, so plan each chain around polarity.
FreeCell's frame is intact — four cells, four foundations, every card visible from the start. One rule is replaced.
Alternating colour, the constraint every player of patience has internalised, is swapped for magnetic polarity: opposite poles attract and stack, like poles repel and will not. It is the same kind of rule — a binary property that must alternate — wearing different clothes.
Which is exactly why it is disorienting. The instinct that says black on red fires on every move and is now wrong, so an experienced player has to work harder at this than a newcomer does. The game is a small demonstration of how much of solitaire skill is pattern recognition rather than reasoning.
Magnet FreeCell reworks free-cell patience with a magnetic-polarity stacking rule. It is an original free browser card game built in-house for PlayPendium.