I want an machine that saves my overall RPG progress over time on my phone over numerous games (in addition to whatever happens over the course of a single game). Sure it would be fun to get XP and level up over the course of 5-10 minutes, but I want to play a game and just grind 1500 pop bumpers because I need pop bumper XP or some achievement, then focus on trolls because my next quest is to kill a certain number of trolls. I'll never shoot a dumb standup that's 10 inches away from the flippers pointed straight at the drain... but what if you told me I can shoot it 50 times and I'll be LEVEL 12?

Use the same plodding system that has people grinding away in MMORPGs doing the same thing over and over for hours just to hit the next level in that thing. Big flashy LCD leaderboards showcasing not the best players, but basically those who have spent the most time and money on the game. I'll keep putting quarters in.