Tetris Worlds - Platform: XBox

Skip Levels In Two Player Mode:
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To go to the next level, you have to win within the time limit. When you get 
to the point where you cannot win within that time, lose and you will play 
level one. Complete it, and you will be at a level higher from where you 
were previously. For example, if you are on level 8, lose and you will play 
level 1. When you complete level 1, you will then be on level 9.

Indefinite Flips:
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When a piece reaches the bottom, you can turn it indefinitely, giving you 
more time to think.

Easy Ranks:
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In story mode you can only gain one rank per game. Once you go up one rank 
(usually after reaching the goal within two minutes for a second time) just 
top out, watch the scenery change, and start again to gain another rank.