Diagonal Blocks is an abstract strategy game modeled after Blokus, and playable with a Blokus set. The pieces, (same as Blokus) consist of a complete set of all polyominoes up to size 5. The board is 20x20 (smaller in 2 or 3 player variants) with the six squares nearest each corner removed. Play begins at a starting square for each player, and each players subsequent move must contact his previously placed pieces only at a diagonal points. The game ends when no further pieces can be played. The winner is the player who covered the most squares with his pieces. Vis-a-vis Blokus, the differences are: (1) The corners are removed from the board so there are barely more squares on the board than pieces to be played. (2) There are no special scoring bonuses. The count of squares covered is the entire score. (3) In two player variants, A "swap" rule applies to the second move. This removes the first player advantage. Variations: Diagonal Blocks (3 player, intermediate size board) Diagonal Blocks Duo (2 player) Diagonal Blocks Classic (2 player, 4 color) Online Play Boardspace.net real-time, AI option Mobile Apps Boardspace.net local multiplayer or online, IOS Boardspace.net local multiplayer or online, Android