Waiting for CPU players to take their turn is fun! So is algebra and having a cold!
The basic premise is that you must take control of a cutesy Tamagotchi character and help them become the next president of Tamagotchi planet. To do that, you must rack up the most money and popularity in a Mario Party-esque board game.
This is, at heart, a Mario Party clone. Yet it is light-years worse.
Party On can be played with up to 4 human players, but even if you play alone, the game MUST have four participants. Therefore, the remaining slots will be filled by computer-controlled bots. (Hey, a rhyme!) It takes place over seven turns, or 'days.' At the end of the seventh day, the player with the most popularity wins the game.
There are several types of spaces on the board. Land on a minigame space, and it's off to some random challenge. Minigames require that you use the Wiimote to wash windows, shake hands, or drive, among other things. Gotchi games are much simpler, like rock-paper scissors or memory. However, all minigames are SINGLE-PLAYER. Plus, there are so few of them that you can actually go an entire game without playing a single minigame.
The Wii's current library shows that it is THE system to have when you have friends over. With so many similar but MUCH BETTER party games for the system (Rayman Raving Rabbids, Super Monkey Ball, WarioWare, Mario Party 8, Sonic and the Secret Rings, etc.) Tamagotchi Party On isn't even worth a rental. You would get much more bang for your buck buying the LCD virtual pet.