Club Penguin Elite Penguin Force for DS
Like, I only played the online game because a friend begged me to because he had nobody to play with, and I thought it was OK but when I heard about the DS game I went ballistic and begged my grandma to let me buy it with her money because the trailer made it look super epic and advertised linking to your real account (which was handy)
little did i know that the game's so damn short you can beat it on the guest settings the first time you boot it up lmao. I loved it but it was over so darn quickly that I feel bad in retrospect
Honorable mention goes to Phineas and Ferb Ride Again as I was a huge fan of the TV show at the time and it was actually a fun well-made platformer, but it was also stupidly short and Disney's dumb social media DGamer network never ever worked, and neither did those DSI minigames. I enjoyed the game itself, but the main reason I regret having grandma spend money on it is because on the way home from the store a driver came at us the wrong-way and just barely hit our car. We had to drive onto a curb to avoid her and then she apologized non-stop for a few minutes before we saw that she was a teenage driver, and thus didn't take her seriously so we left as there was no accident and we didn't want to wait for one to happen
I still worry about how bad it could have been if we did get hit and I would have felt super guilty if something happened because I wanted to get freaking Phineas and Ferb for DS