Check (Mind Loft)

Check is the checkers puzzle in Mind Loft's End Game set. You play red, and the board is set up so that red can take every black piece inside a fixed number of moves, three on weekdays and four on Sundays. A line under the board counts down how many moves are left and how many pieces remain to clear.

The puzzle depends on the compulsory capture rule. Because black must take whenever it can, black's replies are forced, and that is what lets a sweep be planned in advance. Tap a red piece and its legal squares light up, so you do not need to know any notation. There is no take-back, and exactly one first move leads to the full sweep.

Mind Loft checks every board twice, with the engine in the game and with a second, separately written solver, to make sure the sweep exists, takes exactly the stated number of moves and has a single working first move. A new board comes out every day at midnight Eastern, with a Hint button that names the piece to move, plus Give up and Restart (a restart records a 0 and deals the same board).