Rivet Nova: Idle Online RPG
Indie gameAssemble a robot from components, choose a target and watch automatic battles turn equipment decisions into progression.
Fog Kingdom
Play on fog-kingdom-play.chojunhyeok.chatgpt.site ↗Desktop recommended; touch controls are experimental. Opens on fog-kingdom-play.chojunhyeok.chatgpt.site in a new tab. Check the setup notes below before starting.
Gather resources, craft equipment and build defenses around a keep while monster waves arrive through the fog.
Start the browser demo, gather wood and stone, and use Build and Craft to prepare defenses and equipment. Monsters arrive in waves around your keep. Keep upgrades create local checkpoints; Adventure opens further progression options.
The reviewed version presents English and Korean guidance. Its own instructions warn that defense continues when you switch tabs and that Build is not a pause menu. Use the explicit Pause / Guide control when you need time to read.
Fog Studio submitted this independent survival and keep-defense prototype with AI-assisted development disclosed. The exact AI tools are unconfirmed. The linked browser build is the publisher’s own playable destination.
Made by Fog Studio.
Free browser demo without login. Desktop is recommended. Touch controls are experimental and physical-phone compatibility is unverified. Checkpoints stay in this browser; the interface provides checkpoint export and restore. Optional support does not unlock additional game content.
| WASD / arrow keys | Move |
|---|---|
| Click trees / rocks | Gather when in range |
| Click / Space | Attack toward the cursor / nearby enemies |
| B / C / I | Build / craft / inventory |
| U / E | Keep upgrade / adventure |
| P | Pause / guide |
Check the keep’s health and the wave countdown before opening a building menu. A menu can obscure the fight while simulation continues, so use P when reading the guide or comparing unfamiliar controls. Resume only when you are ready to act.
The opening quest asks for wood and offers stone as a reward. Gather nearby resources before committing them to a structure, then inspect upgrade costs. The game says checkpoints are created on keep upgrades; do not assume every action is saved or that a different browser will share your progress.
No. Combat can continue while menus are open. Use the explicit P pause control.
The reviewed browser demo started without login or payment. Optional support adds no exclusive gameplay according to the creator.
The game describes browser-local checkpoints created on keep upgrades, with export and restore controls. Cross-device sync was not established.
Before you play: Early prototype. Initial movement, combat, tower building and menus were reviewed, not every wave, boss, resource-gathering interaction, upgrade or restore scenario. Pause explicitly before leaving an active run.
Sources: fog-kingdom-play.chojunhyeok.chatgpt.site. Last checked .
Assemble a robot from components, choose a target and watch automatic battles turn equipment decisions into progression.

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