Ages 9–14 · Grades 5–8 · Computer Science

GateForge

Inside every computer are tiny switches called logic gates. Here you wire them yourself — AND, OR, NOT, XOR — flip the input switches to watch your circuit light up, then check it against the goal for every possible input. Start with one gate and climb the ladder all the way to a real adder.

Loading the circuit lab…

Meet the cast — the characters who teach this

Each one stands for an idea you’ll practice. Tap a character to read their illustrated story and hear their audio drama.

Duet The AND gate - a firefly who glows ONLY when BOTH her inputs are on; one light alone stays dark (the both-or-nothing rule that makes two-key locks safe)
Orla The OR gate - a welcoming firefly who glows if EITHER input is on (or both); only all-quiet leaves her dark (any one signal is enough)
Nay The NOT gate (inverter) - a single-input firefly who is always the OPPOSITE of his friend: on becomes off, off becomes on (turns a backwards signal right)
Odele The XOR gate - a firefly who glows ONLY when her two inputs DIFFER (one on, one off); same-and-same, either way, leaves her dark (the mismatch-finder, and the carry in adding)
Nandi The NAND gate - off ONLY when both inputs are on, bright every other time; the humble UNIVERSAL gate you can build every other one out of
Norah The NOR gate - glows ONLY when both inputs are off; the smallest spark anywhere sends her dark (the all-clear light; the other universal gate)

Explore all the stories →