Scratch - crossing game

1- The game includes the player and three characters that we call "the guards"
2- The player has to cross the scene from the bottom to the top 
3- The guards cross the scene from right to left and from left to right at different speeds
4- When the player comes into contact with a guard character, he/she loses the game.
5- The game has two stages, each one lasts two minutes
6- The first stage is easy with the guards moving slowly 
7- The second stage is more difficult because the guards' movements are faster
8- The player wins if he/she crosses without touching any of the guards