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Features
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- Bot is able to play "Simon Says" with a human
- The 4 Keys are also the 4 indicators
- Simon raises the keys that have to be pressed
- Annoying sound will make you insane after your first round
- Bot can be built with a single RIS 1.5
- Highscore is shown on the display

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Main Idea
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Before I've read the part with the limit of electronical components I wanted to build a "Safe-wheel" with rotation sensors. After that throwback I thought that a lightsensor which is fixed on a rail is also worth to be build (1Motor, 1LS, 1TS). But this was a bit to odd and wouldn't provide much technical "surprises". The Idea with the 4-key-keyboard has made the run and was built in 4 hours. I've never thought that I would be able to make it, so I'm a winner anyway. I dind't ad a video that shows how I play, because this would be too big for mail (~30MB), but I've added two that show how the stuff works.

!!The videos work only in the Windows Media Player - dont ask me why!!

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Description - Input
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The 4 buttons are cubes with a groove on the bottom and a piston on the side. The patterns are not full, because they move better if they are not full with plates.
If you push a button, one of the two levers gets pushed down and scratches a tough sensor. Two divide between the two possible buttons that have caused that event, I used the lightsensor in the middle. If the pushed button was blue or yellow, a green bar in the center blocks the front of the light seonsor and gives the additional input. There is also a green bar for the other side, but the lightsensor doesn't see it. If you release the button, the white rubber bands raise the lever again and the bar gets horizontal again (It is fixed by the yellow rubber band). Have a look at the input-video!!

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Description - Output
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At each round simon has to "tell" the user which buttons have to be pressed. This bot uses its own buttons to show that. One Motor in the bottom is able to raise 2 buttons by pistons. That makes two motors for 4 buttons. A blue rubberband moves the motor back into  its zero-position. The buttons fall back by their own. This din't work well at the beginning, but a facelifting in the design made it possible. I've also tried to implement a "fallbackmechanism" with rubberbands, but all solutions have blocked the input-cycle.
Have a look at the output-video!!

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Disclaimer
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Feel free to build it, improove it and steel its mechanisms, but don't let me catch you if you say its all your idea! :P