Looney Tunes Collector: Alert!

From the back of the box:

Alert! Alert! Calling all Looney Tunes! Help Bugs Bunny collect twenty-five Looney Tunes allies. Use their special abilities to find the ten missing pieces of the teleporter weapon and throw Marvin The Martian all the way back to Mars!
But your fun doesn't end there! Trade with your friends to collect twenty-two additional characters used to access hidden missions.
And th-th-that's not all, folks! Stay tuned for Marvin's chance to Attack! ALERT!

Collect and play up to forty-seven Looney Tunes characters in twenty graphically stunning worlds.
Exchange characters between Game Boy Color via the cable link.
Play six hilarious real-time games head-to-head against a friend!