Someone PM'd me ideas for new challenges so I figured I'd post them and see if anyone else thought they had potential. There are only a few days left in the year and at this point I won't make any changes unless they're seconded by a few people. Also remember that we'd need to cut a challenge to make room for a new one, so if you like one mention a bad current one!
Beat a Metroidvania
Beat/Complete a game where the central theme is you the player are the bad guy
Beat a game that has a SNOWY TOWN/VILLAGE/CITY
Beat/Complete a game that has a level/mission that takes place on an airplane
Beat/Complete a game that has a fishing minigame/activity
Beat/Complete a game that has a card minigame
Beat/Complete a game that was given to you for free by a service or gift