9 hours 9 persons 9 doors and its sequel Virtue's Last Reward! (But not Zero Time Dilemma, that one sucks)

They're basically choose your own adventure books where holding your thumb on the previous page is central to the plot. If you can, play 999 on a physical DS. You really got have the console in your hands for the best experience, but emulation is mostly alright too. Just not the steam version because it absolutely butchers the story - it rewrites the entire script horrendously to adapt it to one screen.