Zenigata whack-a-mole.
Oh, and Jigen shooting game.
The games are pretty short, though i do admit they were fun to play while they lasted.
Here are a few hints for when you play either one:
For the Zenigata whack-a-mole, you're supposed to get 15 points total to win. You lose points for whacking the commissioner (the guy with the mustache).
The Jigen shooting game requires pretty quick reflexes, as you're supposed to shoot the Jigen double (and nobody else) before he shoots you.
After you win, you are awarded with downloadable avatars of the main cast. The whack-a-mole game has them in 1st series style, the shooting game has them in 2nd series style.