In the unlockable Twinbee and Force Gear minigames, pause the game and press Up, Up, Down, Down, Left, Right, Left, Right, II, I. If done right a sound will be heard. Now, unpause the game and you'll be fully powered up in the TwinBee game. In the Force Gear game, the code works, but its effects are unknown.
System Card Message
At the PC Engine CD boot screen, hold I + II and press Run.
Twinbee and Force Gear Minigames
To unlock the Twinbee and Force Gear minigames, first join the Computer Club. You have to work hard on the club and by the second school year, at the School Festival, you'll be able to play Twinbee Time Attack minigame. Keep working hard on the club and by the third school year, if you are the Club Master, you'll be able to play Force Gear.
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You can submit a problem report for any non-working or fake code in the lists above.