Astria Ascending

This one is pretty self explanatory. You can challenge a basic opponent 100 times to unlock this, but don't bother playing anyone until you've unlocked Ultimate Collector (25G) as you will no doubt need to win more than 100 to fill in your collection.
 

J-Ster is a game somewhat similar to FF8's Triple Triad. You need to use the tokens in your inventory to try and flip the opponent's tokens on the board into your favor. Use the weakness and resistence edges on the game pieces to either do extra damage when placing a token, or to minimize damage on the open sides of your token after placing it. This will allow you to flip the opponent and ensure you don't get flipped right back. Also be aware of the "A" side of a token, which will flip any token played against it. Always aim that into an empty space if possible for a huge advantage. The game gives you a nice tutorial on this, and as you earn better tokens, it becomes much easier.