Wainlock

Wainlock is a sliding unblock puzzle in a farmyard. Carts and tractors slide only along their length on six by six cobbles, and the red hay wagon must roll out through the gate on the right. Forty yards climb from 3 to 33 moves, with haystacks that never move from yard 21, plus a yard of the day. The fewest moves for every yard were found by a breadth-first search over every position, so the three-star mark is the true minimum, and the hint button runs the same search from wherever you are. Unlimited undo and a restart. It plays in the browser with a keyboard, mouse or touch, in English or Bulgarian.