While im waiting for the pcb, i ordered the parts on digikey and did my first calculation.

For the other components i did not crunsh the numbers as much. The reason being: im just a lazy bum.

Parts list so far:

LED, 64x 0,078€
Atmega168, 1x 1.36€
AA Battery holder, 2x 1.30€
0805 Capacitor, 8x 0.063€
0805 Resistor, 17x 0.034€
PNP BJT, 8x 0.065€
Driver, 1x 0.56€
Pushbutton, 8x 0.115€
Powerswitch, 1x 0.56€

= 12.60€

Well a bit over the hoped outcome.

In hindsight there a a few points i could have done better:

I used a AA Battery holder, just using clips or coin cells would cut the cost of them by half or 2/3.
Ditching the Buttons and go for capacitive touch. (I didnt dare to for the contest because i never tried it)
Maybe i can even find a row-driver?
Programming the game will let me see if i can go for a smaller controller.
Heck you could even ditch the powerbutton. Just use the sleep mode and wake him up with a button and ......

But first things first, im getting ahead of myself. Lets make get the first version to work....