Finish the game once in easy difficulty to unlock the gallery. Honestly, it's not even that hard. Most of the time, if you focus on only on getting the last number right, it'll be good enough. And in easy difficulty the game is pretty forgiving. Ended the game almost full life and I'm pretty covinced I didn't understand half the stuff.Can I do the alt+tab trick like their previous game? I can do math but not on time constraints