Valkuil! / Pieges! (1965)

The game consists of a 7x7 board with horizontal and vertical slides that can be in any of three positions each. Each slide has a certain number of holes in it. Initially, the board is set up in any random position, then the players deploy their marbles onto the non-holed spaces. On your turn, you change a slider’s setting, hoping to open new holes underneath opponents’ marbles. The last player to Stay Alive wins.