I've been playing the hell out of Project Mirai DX 2 for the 3DS. I love that you can pick your favorite vocaloid and have them as a pet... a very idle pet that mostly just stares right back at you. It's not indepth, but it has it's cute moments, like how you can buy them an arcade cabinet and watch them rage quit video games. But yeah, you place them in a pseudo-apartment and furnish the place, and one of the things you can get is a tiny Road Roller, which has the description "Muda muda muda muda!" and my Jojo boner was very tickled, thank you Project Mirai. Also, at any point whatsoever, you can press the shoulder buttons together to take a picture of your captive vocaloid to satisfy the Otaku Buffalo Bill inside you. It puts the lotion on the skin Miku...
Oh yeah, and there's the actual gameplay portion, where a random grab bag of popular vocaloid songs are converted into Rhythm games, and that's fun. I was TEARING MY HAIR OUT for the first 10 hours or so, because it uses the entire YXAB game pad for buttons, and I'm still utterly spoiled by the Xbox controller which has YXAB as well... but the Y <> X and A <> B are flipped positions, so my muscle memory was just kicking my ass more than anything. Project Mirai had my back the entire time though, I just had to go into options and it allows me to convert the rhythm symbols into directional arrows, which my brain can actually grok rather just letting my fingers idly hit the wrong buttons and wonder why my score isn't going up.
The hard difficulty songs are where the real fun is at, some are easy enough, but others like 'Hello, how are you' properly simulates what it feels like to be cornered and beaten senseless by a song. 'Ageage Again'? You're gonna be doin it ageage again and again, bitch. Don't even look at Gaikotsu Gakudan to Riria, this was made for the true Rhythm Game savants, step aside mere mortal. You can also tap, but I'm thinking you'd have to full palm the 3DS touchpad in order to keep up with the 3 colors it forces you to juggle, and I'm just not ready for that commitment yet Mirai.
Otherwise all the songs are great, there are very elaborate and well-done little music videos to go along with all of them as well. Too bad they're often ignored because I'm focusing too hard on the little buttons. There's a theater mode though, if you want to watch them, and you can even mash buttons and make tons of random noises, like you're an actual one-man-band in the audience trying to drown out the Artists at a concert.
Oh, and there's reversi and Puyo Puyo Fever as well, which the computer will not hesitate to just whoop you ass in. Like, just fucking clobber you. You'll be crying yourself to sleep after this curbstomping, gawdayum. 10/10