Using the stylus, players can line up four PokÃ©mon puzzle pieces in a row (vertically or horizontally) to create a "Trozei" and add PokÃ©mon to their Trozei List. Once a Trozei happens, it can be turned into a chain reaction by lining up three in a row, and then two in a row, to clear those pieces from the screen. The longer a player keeps a Trozei going, the higher the score. However, if the pieces stack up too high and reach the top of the screen, the game is over.
Another game objective is to complete the Trozei List. This list contains all PokÃ©mon that a player has been able to Trozei. Some PokÃ©mon are harder to Trozei than others. Players can increase their chances of finding rare PokÃ©mon by playing wirelessly with friends. Players also can frequent the "Agent CafÃ©" and use the "Espionage Mode" to exchange "Agent Cards" with friends for a chance to catch other rare PokÃ©mon.
There are four modes to play in PokÃ©mon Trozei: two single-player, a battle mode for two players to go against each other and a mode for teaming up with a friend. The multiplayer modes use the DS wireless function. The game also has a wireless distribution mode where players can relay a playable demo version of the game â€“ PokÃ©mon Trozei Mini â€“ that allows other players the opportunity to experience the game.