Games Like O0 to Hero
Your C, the assembly gcc writes from it, and the machine running it, on one screen. Learn C from the bottom up: real gcc grades your code, scenes show the stack and registers at work, and arcade games train the bits under your fingers. -O0 means no optimization, the most readable assembly there is.
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O0 to Hero
SteamAbout O0 to Hero
See what your code becomes
Write a line of C and the assembly gcc makes from it appears right beside it, line for line, in matching colours. Change the C and watch the assembly change. Nothing is hidden: this is the real compiler, at -O0, where every variable keeps its own slot on the stack and every step shows.
Watch the machine move
Animated scenes show what the CPU and memory actually do: a value loaded into a register, a slot on the stack overwritten, a byte split into the two hex digits you read every day. Pause them, step them, replay them.
Play the bits
A course underneath
Lessons start from zero: what a program is, how source becomes something the machine runs, why memory is numbered bytes. Then C itself, with every new idea read back in x86-64 assembly. Real checks grade your code. A failed Submit costs nothing. Quiz cards you miss come back until you get them right.
In the Playtest
Why -O0?
-O0 is the gcc flag that turns optimization off. The compiler then writes the most literal assembly it can, which makes it the easiest assembly in the world to read. It is also the slowest, which is a trade worth making while you learn. The hero part is up to you.
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