I know that video games are great tools when it comes to training up you eye-brain-hand co-ordination, but for those who are on a tight budget and cannot afford to purchase game after game every month, there is always a cheaper alternative, although the addictive level is not there. The Nano-Tech Water Drop Puzzle relies on a special nano technology panel design that does away with the need for a small ball bearing within, but uses some water instead. The water will zip by really quickly, and the whole goal of the game is to move these droplets into the right position. There are four different levels of difficulty to choose from, and you can pick it up for $22 a pop. Choose from yellow, orange, grey and blue colors.