OTTF - Version 5.7 OTTF (One Two Three Four) - a logic game where player have to place the checker as shown in the game template. The game has two game modes: the play for time (Online Highscores) and free mode. There are 70 levels in the game. Pleasant music (F6 - Music track back / F7 - Music track forward).OTTF (One Two Three Four) - a logic game where player have to place the checker as shown in the game template. The game has two game modes: the play for time (Online Highscores) and free mode. There are 70 levels in the game. Pleasant music (F6 - Music track back / F7 - Music track forward).OTTF (One Two Three Four) - a logic game where player have to place the checker as shown in the game