Smooth Drag & Drop user intece. Blokus is a family game involving four players and a board with 20 x 20 squares. Like chess or checkers, it's a game for which at any time you can see your opponent's pieces. No ads at all. Each player starts with 21 pieces : 1 monomino, 1 domono, 2 triominos, 5 tetraminos and 12 pentaminos. "For first round, I must place a piece so that it touches one of the corners of the board" "Next, a piece must be placed so that it touches a corner of one of my own pieces. It may touch several corners, but never any side/edge of my pieces!" Look at screenshots or at the video. The game has a nice and natural User Intece : just Drag & Drop the piece with the finger. Rotate a piece likewise. You can flip a piece to its mirror position with a long-press gesture. "If a cannot place any more piece I pass my turn." You can see opponent's remaining pieces, by pressing corresponding tab. The end of the game is reached when every player passes. "My score is : addition of the squares of the pieces I placed". Refer to 'Menu > Help' inside the app. With several screenshots. You can safely quit at any time : your current game will be restored on next startup. You play against the machine. You can configure the level of corresponding Artificial Intelce : 4 levels. Refer to Menu > Preferences To play against friends, you can disable AI. Go to Menu | Preferences. Later use the 4 tabs at the bottom to select next player.