Why Dejeweled will be fun

In terms of the three reward types that make a game fun, this game satisfies competence by its level-based progression and unlocking of new building parts. Also, the visceral action of the player's machine emphasizes the feeling of mastery and effectiveness when a ragdoll is successfully killed. It satisfies autonomy in the ability to design whatever sort of contraption you want within your abilities and your in-game resources. Each unlocked building part offers a new opportunity for experimentation. Finally, it satisfies relatedness similarly to Line Rider in the ability to share your unique designs with others. This can either be through YouTube or directly facilitated by the game with a copy'n'paste-able killing machine format.