Product notes
Product updates, new challenges, and improvements, newest first.
TCP Servers in Rust
Learn to write a TCP server using Rust's standard library.
Concepts before challenge stages
A prerequisites card linked Redis learners to relevant concepts, including language-specific lessons.
TCP Servers in Go
Learn to write a TCP server using Go's networking library.
Experimental AI hints for stage two
Learners could request AI-generated hints for the second stage of a challenge.
Weekly coding contests
Weekly coding contests launched; live leaderboard updates and contest-history navigation followed during January.
DNS leaves beta
The DNS challenge moved out of beta and enabled paid access.
Custom invoice details
Add extra invoice information during checkout to help with reimbursement.
A test results bar
A dedicated panel introduced test status and logs, with layout and browsing improvements following later.
Backreferences for your grep
Extend your regex engine with capture groups and backreferences that match previously captured text.
A BitTorrent walkthrough
A BitTorrent walkthrough joined the Screencasts tab, which was later retired in March 2026.
Less waiting for test builds
Test-run setup was prioritized to reduce time spent waiting for a build to start.
Live challenge updates
Challenge pages began receiving updates immediately rather than waiting for polling.
Reading is good.
Doing is better.
Build your own Claude Code, Shell, or SQLite. Understand what’s underneath.