No account · no install · no server
Make a program move in five minutes.
Edit real Kofun. This page compiles it to WebAssembly and runs it locally. A share link keeps the snippet in its URL—not in a backend.
Your guide · Kofun-kun
I turn compiler output into colour and motion, then point you to the next small experiment.
Tap or focus me for a cheer.
Bring what you know
Honest coming-from guides
Each comparison says what transfers, what surprises, and where Kofun is worse today.
Current, executable boundary
This is a real compiler—and a deliberately small one.
The browser compiler accepts one fn main(), immutable Int
bindings, print, parentheses, and checked Int64 arithmetic with
+ - * / // %. It has no Text, List, records, functions,
DOM API, ownership checker, linear memory objects, WASI, packages, or optimizer yet.
This tour uses the canonical 16×16 Kofun-kun pixel grid from hjosugi-hub. The grid is copied locally under its 0BSD license, so opening or sharing the tour never contacts that site.