World Championship Poker - Platform: Nintendo DS

Avoid repeating earlier rounds:
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After you completed the first round of a Hold 'Em tournament, don't go 
"all in" on a hand in the later rounds. When you get down to around $500 
or more, when asked if you want to play again at the end of a hand, you 
have to say "No". If you do this, you can start the tournament over again 
on the round you are currently on instead of completing the earlier rounds again.

Nebula Secret Chips:
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Go next to the tournament table in the Wild Corral casino. Use the map to 
find the northeast corner of the room and look at the floor. 
You will find a red poker chip that allows you to enter the Nebula. 
You may first need to play some of the Wild Corral tournaments. 
Enter the Air Hockey room from the right side entryway. 
Look along the floor of the right wall to find a red poker chip. 
Pick it up and you will be able to enter the Nebula.