CheatCodes.com has all the official Phantasy Star Online 1 & 2 Plus GameCube cheats to unlock everything. If you know of any that we don't have, please let us know.
All published and official codes as of Wednesday June 19, 2013 for Phantasy Star Online 1 & 2 Plus are shown below.
To unlock the mini games go to the mission called "The Fake In Yellow". Beat the mission all the way until you get to the professor. When he opens the telepipe go in it. You will be at Pioneer 2. Go right back in the same telepipe portal as the professor made for you. Do NOT complete the mission. When you arrive in the Forest you will see three Rag Rappies. Just ignore them and look for some waterfalls in the background. The waterfalls are in the room that the telepipe is in. When you find the waterfalls go stand by the wall that is nearest to them. Now a Chao from the Sonic games will appear. (Remember when you release your Chao's it says that they will live happily in a forest?) He will talk to you and give you the mini games. Now go back to Pioneer 2 and you should notice that a GBA machine is located near the enterance to the Hunter's Guild. You must have a GBA and a connecter to play the mini games.
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