Folio is an Icehouse-based abstract strategy game for two players. The rules are simple, but the strategy can get mind-bending. It owes some rule ideas to the commercially available game Quarto (thus the name). To play you require one stack of pyramids from each of four colours plus one extra from each colour (with only two of these being of the same size). You also need a chessboard or similar 8x8 grid.