Super Mario Strikers - Nintendo Gamecube
Lists of top-ten best Gamecube games are usually comprised of about 9 first-party Nintendo titles, and Resident Evil 4. You always have Metroid Prime and The Wind Waker in the top 3, but after that I've seen Pikmin, Pikmin 2, Wave Race, Twilight Princess, Luigi's Mansion, etc. And sometimes, every once in a blue moon, hovering at around the 9th or 10th spot is a third-party title featuring first-party characters shoving and checking each other in pursuit of a soccer ball. This title is Super Mario Strikers.
Super Mario Strikers is a soccer game with slight modifications to the traditional rules of the international sport. The goal is still to kick the ball into the net of the defending team, but this wouldn't be a Gamecube game without some re-imagining of sorts; Super Mario Strikers is the only Mario-sports game I can think of to place this much emphasis on violence. During a match, you are encouraged to switch back and forth between each of the 4 players on your team to score as many points as possible. Normally this would mean good teamwork and skilled playing, but Strikers cares much more about the instant-gratification that comes with punching and slide-tackling your opponents than it does about adhering to classic soccer techniques. It's super fun and easy to knock the members of the opposing team into the electric walls surrounding each soccer field, and combining these attacks with Perfect Passes, Super Strikes, and dekes is the best way to ensure you have an extremely exciting Mario soccer match.
The unlockables in Super Mario Strikers, not including the cheats, also leave something to be desired. There are 9 playable teams in the game, and only 1 of them has to be unlocked by playing Cup Battles. You will also unlock different stadiums by completing certain cups, and although I do have my preferences now that I've unlocked them all, each are barely more than color-swaps, and none of them change the gameplay at all.