Getting a game without smurfers and total noobs in Dota 2. In every single game I've played since stating pub games there have been two types of people:
People who take shadow fiend, medusa, drow, pudge, viper, sniper, etc and roflstomp their way to victory on a pile of feeding idiots and people who take recipe first and dive tower before the first creep wave spawns[footnote]This actually happened once. Someone grabbed the recipe for Shiva's Guard and went bottom. I saw him move past the tier one tower before creeps spawned, pinged him and said b. He kept right on going. Rushed tower, died in five hits and dc'd. I'm pretty sure he gave up on dota right then and there.[/footnote].
Take a wild guess which type comprises my entire team and take a stab in the dark at whether or not the other team are all smurfers. Fuck the lack of a proper ranking system in that game.
Edit: Just realized that's not really a challenge per say. I'm also doing an ironman playthrough of FarCry 3. No story missions, no radio towers, no survivability perks, all options off (indicators, reticle, auto aim, etc.), no cars, no fast travel, no ammo refills at outposts (except arrows) and my only weapons are a bow, the starting pistol, a flare gun and a skorpion (without attachments). Oh, and I'm playing on the highest difficulty. I win the game if I take down all the outposts on the first island.
So far I've got six or seven of the bases captured I'm fairly sure and it's been a hell of a time. Challenging and exciting, but immensely rewarding and fun when the last pirate falls in the outpost. I might even consider doing a full story playthrough using these options (minus the no story mission of course) at some point in the future.