STEAM
GateForge
Build logic circuits and watch them light up (ages 9-14). Wire AND/OR/NOT/XOR/NAND/NOR gates together, flip the switches, and see the truth table come true - digital logic from a single gate up to adders and a tiny CPU. Meet the crew of fireflies who each ARE one gate: Duet glows only when BOTH are on, Orla when EITHER is, Nay flips its friend, Odele lights on a mismatch, Nandi and Norah are the two you can build everything from. On-device, no accounts, no ads.
▶ Play it nowBuilt for sittings of about 20 minutes on the screen. That is our design budget, not a measurement.
Meet your mentor
Every Spark & Anvil app has a friendly mentor character that demonstrates, asks, and patiently scaffolds learning.
#0369a1 Characters who teach
Meet the cast
GateForge's fireflies are logic gates, one apiece. Wire them together, flip the switches, and watch who glows: Duet needs both inputs, Orla needs either, Nay is always the opposite, Odele lights up on a difference, and Nandi and Norah can build all the other gates.
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)
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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)
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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)
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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)
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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
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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)
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Browse all chapters → · What's distributed-narrative methodology? →
What's inside
Learning goal
Build logic circuits and watch them light up (ages 9-14). Wire AND/OR/NOT/XOR/NAND/NOR gates together, flip the switches, and see the truth table come true - digital logic from a single gate up to adders and a tiny CPU. Meet the crew of fireflies who each ARE one gate: Duet glows only when BOTH are on, Orla when EITHER is, Nay flips its friend, Odele lights on a mismatch, Nandi and Norah are the two you can build everything from. On-device, no accounts, no ads.
How GateForge handles your kid's data
- ✅ All progress, settings, and AI-generated content stays on the device
- ✅ No analytics, no tracking, no third-party SDKs
- ✅ Free — no ads, no in-app purchases
- ✅ No personal information collected from children — in line with COPPA (updated by the 2026 FTC amendments)
- ✅ No chat with strangers — play-together rooms use a short code and preset emotes, never typed messages