In each level, Mario must collect a set number of stars (see the top of the screen for the exact amount). Once he collects all of them, the exit door will open and Mario can proceed to the next level. Be careful of the enemies that litter the levels. Victory will require you to do a little puzzle solving to find the right [P] blocks to step on. There are 10 total levels and they go fast. You could probably beat this game in 15 minutes.