It's on psp and I think it got pretty mixed reviews, I think, but I just started playing Metal Gear Acid 2, and that game is great.
Takes a little getting used to at first, but as you play it the rules are easier to understand. From what I understand, you also don't need an knowledge of any other Metal Gear Acid/Solid game, this one stands on its own..
Metal Gear Ac!d is fun until you get to the parts where you're forced to fight. the guns are too inconsistent to do you any good.
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Magic is by far and away the best card battling game. The Duel of the Planeswalker games are pretty good. There are demos on the store if you want to try them.
The Pokemon TCG is free to play on the PC. You will have e starter decks available to you and if you purchase a physical theme deck, you can play it on the PC.
The iPad has some good games right now. Along with Magic, Shadow Era and Assassins Creed Recollection are solid. Mothers are others at are fantastic like Ascension, Nightfall, Sumoner War, etc. but they are a bit different mechanically.
Eye of Judgment was actually pretty solid, but the servers are down now.