Various fantasy environments with "environmental riddles" (finding paths/collectibles). World 9: The final stage. Technical Guide for TiNYiSO Releases
If your goal is purely for achievements/trophies, a known "cheat" exists for some versions: Connect a to your device. Aery.Sky.Castle-TiNYiSO.rar
The game consists of that can technically be played in any order, though the hub world guides you through them sequentially. World 1: Starting sky area with floating islands. Aery.Sky.Castle-TiNYiSO.rar