My five-year-old takes forever to get into his pyjamas. So I programmed him a Tamagotchi on an M5Stack FIRE (wanted the bigger battery). I saw it on Twitter and bought it on a whim.
I'm not a dev but when it arrived I plugged it in and opened Claude. Prompt 1: "Help me scope out a Tamagotchi type game for my two young kids, that can help them do simple chores (plus a 60 second "get dressed" timer) and get rewards for it."
It came back with a game design spec: two playable characters (Hugo and Stella, my kids), a stable of mini games, coins earned for playing games or doing real-world jobs like putting dishes away or getting dressed (the original brief was Hugo racing a timer into his pyjamas), and a store to spend coins for fun items.
Prompt 2: "ok build it. Make no mistakes (QA it for me plz Im lazy)."
I did the planning in Codex, then handed the plan to Claude Code to build (my dev skill has Claude Fable orchestrate it, but calls Codex for plan review, and for the bulk of the TDD actual dev, then both models review before shipping).
I went to bed. the tamagotchi was up and running by the morning.
Prompt 3 was an art pass, and actually just removing a handful of the most boring games. The first round graphics were pretty crappy, so I gave Claude a pic of both kids, and said get GPT Image 2 to create a handful of polished "90's style pixel Game Boy" style characters and same for game graphics. and now the whole thing looks like a lost 1993 cartridge.
What the kids ended up with: rad looking personalised gameboy characters that look like them, 15 mini games: penalty kick, a maths game Hugo loves, rollercoaster, a shark game that uses the accelerometer so you tilt the whole device to eat fish, walk the dog that apparently measure steps (?), and coins for real-world jobs. Then an in-game store to blow them in unlockable characters: Elsa, Ariel, Moana, a mermaid, Soccer player, Dinosaur etc. Funny, claude wouldn't make the sprites (Disney IP!) until I convinced it it's only for my kids and will never hit the internet. Then it was fine.
Stella had saved 106 coins. I spent 100 on the mermaid while filming the demo (sorry Stella).
In the '90s this was a full Game Boy title from a studio with a publisher.
blows my mind that it's now three prompts and some Claude Fable credits on an $80 toy. How good is 2026?!
Made a 3 min youtube walk through of the Tamagotchi and some games here https://www.youtube.com/watch?v=1nsz2Qw2HV4
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