This review is only for Aquatica because I haven't played the 2 other games.There's 2 gameplay modes in Aquatica,one of them is challenge mode,which involves alligning 3 blocks of the same color so they'll disappear and you have to stop the blocks from reaching the top.The blocks pieces that fall from the top contain 3 blocks and the pieces are always in a horizonal shape and you cannot change their shape,but you can adjust the block colors.You have to make diagonal lines of 3 blocks of the same colors.

The other mode is named puzzle mode which involves removing mines by matching 3 blocks of the same colors with a mine.

I guess you could same the game is very similar to SEGA's colomns.

The underwater environment is nice and has colorful fish and nice blue water and the music is relaxing.The game only cost me 4 AUD and was fun for a couple of hours which is worth the 4 AUD price I guess.