Machina is an upcoming video game where you build Machines like Jigsaw puzzles.
Fold Wars is a Tower Defense game that challenges your ability to think logically in time and space. You place towers on an open map to protect your gold from enemy. You carve the path the enemy takes with the towers you build. Depending on the enemy strengths and weaknesses you plan your strategy to place right type of towers at right place at right time. The score takes into account all aspects of your strategy and rewards you for the most efficient plan. There are many difficulty levels to choose from, so you don't get stuck.