This is THE best game I've ever played. I hated it when I picked it up, but eventually came to love it. The game gives you so many choices such as planetariums, devil/angel deals, alt paths, and final bosses. You don't have to unlock everything on your own. Just download a 100% savefile on speedrun.com The game version here on GOG is 1.7.8.a The latest version on steam is 1.7.9.b It's 3 patches behind Steam which is not the biggest deal in the world imo. This means your game version is compatible with the majority of the mods out there. Speaking of mods, you can purchase the game on steam, then download all the mods in workshop and refund it XD. I'm running 70+ mods atm and the game runs rock solid. Anyways, after you get used to the game, you should learn how to rig your runs. For example, get used to secret room item pools because its where the most broken items spawn. e.g glitched crown, death certificate, rock bottom etc Watching issac youtubers help a lot if you want to learn the game.