Algodoo

how far the green lights supposed to go? mines going at 2m/s to the right, is pretty far right now..

I dont know how to use it. what are the multicolored things and where do you put them

What do I do with the cards?

Use the drag tool to drag the second card from the bottom (the one that works) under the numbers so that the ends line up. Hold the down arrow until the press reads the card and some of the 0s turn to 1s. Now you need to hold the up arrow so that the lock thingy can get the reading. After the lock thing has the reading you need to hold the right arrow key to slide out the block (assuming you used the right card).

It's actually quite good, but I agree that it's very confusing. Probably should have used one good card and one bad card so people don't get confused.