ASTRA Arcade
Six browser games in one arcade, including mountain rally, snowboarding and antigravity racing; counted as one collection.
Play two unofficial game ports, Mario platforming and Duck Hunt, in one browser cartridge interface with on-screen movement, jumping and tap-to-shoot controls.

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; free, no login or download. On-screen controls and controller setup are provided; counted as one collection.
GPT-6 Astra
X — The creator identifies the port and its updates as a GPT-6 Astra project. This attribution concerns the browser port, not the original Nintendo games or assets. 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.