If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
The rat is eager to play the guitar. Help it to get near the guitar by crossing the paths in the maze. Left click the given control preferences and drag it towards the rat. Use the appropriate control at the right time to reach the destination (guitar) and move on to the next level. Your score gets increased as the mouse moves on and on towards the guitar. Make sure that you complete each level within the given time, else you lose the game.
This game is played with mouse only.