IO wargame
Log in over SSH and work through binary exploitation levels
IO is a long-running SSH wargame. You log in as the first level user, study a small vulnerable C program on the server, and use what you learn to obtain the password for the next level. Each level introduces a different class of memory-safety bug.
Free · No login · SSH · Intermediate
About IO wargame
It trains C reading, debugging with gdb and radare2, and low-level exploitation. It suits players who have finished beginner wargames such as Bandit and want harder binary work.
You connect with any SSH client using the public first-level credentials shown on the homepage, and a web terminal is also offered. It is free and needs no sign-up. Sibling games cover x86-64 and ARM.
On Breakpoint since 25 Oct 2026.
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