From the Super Mario Wiki
Trampoline Time is one of Mario's minigames in Super Mario 64 DS and a Variety Minigame in New Super Mario Bros. In this minigame, the player has to draw trampolines so that the Mario clones can jump on them and bounce to open windows.
The game starts with a giant trampoline that will disappear after three Marios land on it. A player can draw more trampolines with the Stylus; however, they will disappear with only one Mario landing on them. There is a limit of three trampolines on-screen at a time, with the exception of the giant trampoline. If a Mario lands on the center of a trampoline, he will bounce higher than normal. Also, if a Mario hits a wall at the right angle, he will jump off of it for even more vertical distance.
For each Mario that the player guides to safety, they receive a point. However, if three Mario clones fall off the screen, the game ends. The open window that the player must try to bounce the Marios towards changes periodically between the higher and lower windows. For every ten Marios that the player guides to safety, the structure will increase in height (making the game more challenging), with the structure reaching its maximum height when 60 Marios have been guided to safety. Also, Marios will appear at a faster rate as the game progresses.
The icons are different between Super Mario 64 DS and New Super Mario Bros.; the former's icon shows Mario facing the screen while jumping, but the latter's one has Mario seeing the trampoline.
Draw a line on the Touch Screen to create a trampoline. You can draw up to three lines at a time. Use the trampolines to bounce Mario to safety!
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