ASTRA Arcade
Six browser games in one arcade, including mountain rally, snowboarding and antigravity racing; counted as one collection.
Switch on a virtual monochrome handheld and choose from twelve small games, including Snake, Blocks, Breakout, Mines and an eight-level Sokoban.

Details
The work description and facts above come from the upstream README. Any Astra Games guides are listed separately, with their own sources and verification notes.
Platform
Browser; click the power switch, then use the on-screen D-pad and A/B buttons. Free at the time of checking; no login.
GPT-6 Astra
X — The creator says Astra assisted the coding and design of this browser-based retro console project. Verification notes.
Six browser games in one arcade, including mountain rally, snowboarding and antigravity racing; counted as one collection.
An unofficial multiplayer Chao Garden fan game: choose a Sonic character, explore the garden and interact with Chao.
An interactive particle-art sandbox: morph 48,000 light points between a flower, a gravity ring, and a galaxy, disturb the sculpture, and export a moment as a poster.