If you like the first one, make sure you try out the second one. It improves on the formula and is overall the better game. There's a demo on the store and the full game is only $8.
Is this US only? I can't find any way to download these for free. I've checked on the Vita store and on the PS3 and no mention of an anniversary sale. I'm in the UK.
Sumioni has a demo, I didn't think much of it. I got Dokuro in the sale, the puzzle gameplay is fun, but the controls aren't quite right and the game is apparently 18 hours long, which for me, is just too long for what it is.
If you like the first one, make sure you try out the second one. It improves on the formula and is overall the better game. There's a demo on the store and the full game is only $8.