Ramps is a good fun game, which I seem to have found rather easy. I am not sure if the games is tough but I managed to reach level 22 in a couple of minutes before I decided to stop playing an put it up here.

Ramps Objective:

Move the Ramps in position change the angle to get the ball from the top to the bucket below without falling in the lava. You need to click on the green spout on top to get the ball out.

Although this game may not be as complex as the other games here I am sure it gets tougher as I can see a steady progress in complications from level 15 onwards.

Ramps Source

Ramps Level Codes

Ramps Embed Code
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