I keep playing Puzzle League (whice surprisingly also is the title of the DS title, whice I also have) all the time back then when I got it. Infact it took me some time to get used to making chains and combos. But by the end I was finally able to beat the Hardest Character.
Also my bigest archievements:
Won 99 Times while my mom just won like 1-3 times.
Beat Hardest mode.
Beat Puzzle Mode Level 1.
Beat Line Mode.
Figured out that the password for the hidden Mewtwo fight was "(B) ^ [L] (B) (A) (S) (A) ^ [R]".
Endured for 6 minutes against a friend in VS Mode.
For the GBC game... well... I didnĀ“t really have it but I did play it since my old friend had it. But we prefered to duke it out on the N64, since it had a VS Mode.