Roll, dive, and glide through a solo ocean race.
A solo race inside Subnautica that brings in real content from your installed copies of Marble It Up! Ultra and Exo One.
Roll and jump through obstacles as the original ColorSwirl marble, switch anytime into Exo One’s craft, gravity-dive to build speed, glide across the ocean, and land for a precision marble finish. Switching preserves your momentum.
Island Relay is a balanced first course designed for 60–90 seconds. It includes nine ordered checkpoints, a race timer, personal bests, instant restart, and checkpoint recovery with a three-second penalty. The race uses its own Creative session. Movement, look, jump and Sprint follow your Subnautica bindings; Q switches, R restarts, Backspace retries, and F7 returns to ordinary diver control. The four custom keys can be remapped in the mod’s config.
Required: Windows x64 Steam copies of all three games: Subnautica, Marble It Up! Ultra, and Exo One. The latter two are located automatically through Steam’s library manifests. Missing or unsupported source content produces an in-game explanation. No game files are redistributed. Tested Steam builds: Subnautica 20241558, Marble 21726295, Exo One 16676923. Other versions are untested.
Solo only. BepInEx 5 is installed by Melty; the asset reader and Python runtime are bundled. Content preparation is automatic on first launch.
Credits: Jackson Kohn, made with Codex. Subnautica by Unknown Worlds; Marble It Up! Ultra by Marble It Up; Exo One by Exbleative. Uses BepInEx, UnityPy by K0lb3 and contributors, Python and the credited libraries whose license notices are included. This is an unofficial fan mashup.
License: MIT for original mod code, with remixes enabled. Game content and third-party libraries keep their respective rights and licenses.
