I made the game that I used 12 LED for using breadboard and ATtiny13a.
I can buy ATtiny13a in a half dollar in Japan. It is a very cheap microcomputer. Memory is low and 1KByte.
I challenged the making of Ladder game in 1KByte.
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Step 1: Sketch
Step 2: Material
1x Mini breadboard
1x CR2025 CR2032 3v button battery holder
1x Button(Tactile switch)
1x 10K resistor
12x 3mm LED
Step 3: LED
Step 4: Jumper Wire
Step 5: Button
Step 6: ATtiny13a
Step 7: 12 LED
Step 8: CR2025 CR2032 3v Button Battery Holder
have fun :-)
SANUKI UDON made it!