O is a robot specially born to explore the secret realm, it is invincible.
You will control O to go to a rare and uninhabited secret realm, control the direction and distance of O during the adventure, travel through the secret realm to find treasures and bring them back to the transmitter.
During the adventure, you will face various ancient organs, difficult terrain, and magical creatures. Use your reaction and wisdom to solve various difficulties along the way!
In this game, you can:
- Challenge 100+ levels and bring back the treasures.
- Use collected treasures to synthesize useful or interesting items.
- Obtain the memory fragments of the area during the adventure, and get a glimpse of the history that once happened
- From the low-text design, you can feel the story belonging to the secret realm.
- Enjoy the art created by humans and AI.
![The Eternal Castle [REMASTERED]](https://img.xd.deals/capsules_thumbs/c3/cf/c3cffed2f815dc97a4547fe3d3deff52a2c63094_280x160.jpg)
