I was going to try the game out, not knowing what to expect, but when it loaded, I got an error message about being unable to save data or something of that nature. Anyway, when I shut my DS off and restarted, my flashcard's firmware was toast. I was able to put the firmware back on and there doesn't seem to be any damage to other games and save files that were there, but just wanted to give a head-ups to people. I'm using a CycloDS Evo card with the 1.22 firmware (I haven't updated yet, and won't until 1.4, since I'm reading reports of Ninja Gaiden DS not working on the 1.3 firmware). I haven't done any further experimentation to prove that Go Pets is what caused this, but it's likely.