Block Fit
fill a row or a column and it snaps off.
drag chocolate pieces onto an 8x8 bar; full rows and columns snap off, and the run ends when none of your three fits
Three pieces lie on the foil. Drag one onto the bar: fill a row or a column and it snaps off. Two lines in one drop, or a snap on every hand, and the points multiply. A new hand comes only when all three are down, so when none of the three fits anywhere the bar is done.
Concepts: planning, spatial-packing.
An interactive you play with one thumb, on Wundr.