If you've ever played
Collapse, then you have the basic gist of how
Groovin' Blocks is played, but there are a few new twists. The blocks are going to fall straight down in a line. You can change the order of the blocks, but you cannot rotate them a different direction. You start out with three blocks coming down, but as you get to higher and harder levels, the number of blocks increases. You are still only able to change the order of the blocks though. When you get a line of 3 blocks together either horizontal or vertical, it will clear off all blocks of the same color that are touching that group of three. The more you clear at once, the more points you get.
Now all that is very simple, so let's add in the musical aspect of the game. On the sides of the board, you will see lines coming in from the outer edge towards the board. These lines represent the beat of the music. What you want to do is press the down arrow and cause the blocks to fall so that they hit on the beat. Personally I found it easier to just listen to the music to hit the beat, but they're there if you need them. Every now and then, you'll also notice beats that glow brighter. These are super beats. You want to hit these every time that you can because they increase your multiplier. Every time you cause a block to fall on the beat, you will add to your multiplier count. Once you get enough beats, you will get a 2X multiplier. Hitting the super beat will increase this to 4X. You want keep this multiplier going as much as possible. If you force the blocks to drop off beat, it will end your multiplier. If, however, you just let the blocks fall on their own, it will not kill your multiplier even if it hits off beat. Sometimes this is preferable because you really want to keep that multiplier going to get the highest score possible.
You can also choose to play Groovin' Blocks with a friend in Multiplayer. Unfortunately you cannot play online multiplayer, which would have been nice, but locally you can play co-op with your friends or against them if you wish.