Labyrinth - if you’ve never played it, all the players are moving around a maze collecting items on cards they draw from a deck. Whoever collects them all first wins. You can move as far as you want each turn, but the catch is you first change the maze (the whole board being made of movable tiles), then move your totem. It encouraged complicated spacial reasoning and leaves room for sabotage of other players. Any number of players can play; you can even solitaire it if you want.