Some guns in SAS Zombie Assault 3 Coin Doubler in Jetpack Joyride Extra money in Monster Shooter I think that's it.
Never bought in-game money or coin doublers and never will. I did however buy the full game unlock for Magic the Gatheribg 2013 and 2014 and a levels pack for Highborn.
Only game to spend money on HEROES OF ORDER AND CHAOS seem like they are now consistently adding content now at 37 heroes and counting
So many different ones, but the ones I still play include: Ski Safari (doubler; bought the game when it was premium) Pocket God: Ooga Jump (doubler; bought the game when it was premium) Jetpack Joyride (doubler; will buy the sleigh as soon as I get new iTunes cards) Sonic Dash (doubler; bought the game when it was premium) Temple Run 2 (doubler) Flick Kick Football Legends (cheapest IAP to disable ads) Nimble Quest (doubler) I don't play it anymore, but I also bought every single table in Zen Pinball (I got rid of my iPad, and I hate playing it on the iPhone). And I've also done doublers or other IAP in premium stuff.
Spent money on The Walking Dead (all Season 1 episodes) and CSR Racing. Never shared, don't like to pester my friends.
Cannot remember names right now, but basically everything where I play for more than 10 hours gets some money from me (usually 5+€) , provided it's not a blatant cashgrab (Dungeon Hunter 4, looking at you). In any case, that's only a handful of games for me, as there are enough high-quality fullprice games out there; and my free time is very limited, so I spend it in my genre (real RPGs like Avernum or Baldur's Gate, strategy like XCom) mostly. Bought the big 50€ pack at Ravenmark:Mercenaries launch to support the devs, and like 10€ to get all ships in Strikewing:Raptor Rising, also to support the devs. Full game unlocks, additional content, etc, I do not count as F2P. E.g. the Kingturn games, or Warhammer Quest.
The only F2P game I can remember buying an in-app purchase for is Clay Jam. I bought a permanent power-up upgrade specifically BECAUSE IAPs aren't necessary to advance the game -- I just wanted to support the devs in some small way. It's the most uncynical "freemium" game I can think of. <3
Purchased a few songs on Theatrhythm Final Fantasy. I loved Elite Beat Agents and I have a soft spot for Final Fantasy and it's music from the SNES era.