The developer of mobile games Card Crawl and Card Theif Arnold Rauers explained how making his games F2P reflected on the revenue stream.
Back in August, a German Mobile Developer Arnold Rauers a.k.a. TinytTouchTales did something not many developers are courageous enough to do – made his acclaimed games Card Crawl and Card Theif free-to-play. Despite that, the revenue those games bring and the number of players have grown significantly after the games were made F2P. According to Rauers, downloads on iOS's App Store are up by 280%, revenue up 41%. While Card Thief was downloaded the most, its revenue declined by -1% but Card Crawl's revenue increased by 168%.
This experiment shows that in-game purchases can easily make up for the game's free-to-play status, given you have a large enough player base, which you will have due to the boost of downloads.
Rauers' Card Crawl is a solitaire-style Dungeon Crawler played with a modified deck of standard cards. In the game, you will need to clear the dungeon of 54 cards by using item-cards, slaying monsters, and managing your limited inventory. For each run, you can use 5 ability-cards which will give you unique skills.
Card Thief, the official follow-up to Card Crawl where you move through a deck of cards as a stealthy thief. The mechanics of the game are similar to the original one. In order to progress, you will need to sneak in the shadows, extinguish torches, pickpocket guards, and steal valuable treasures without getting caught.