💾 Want this plus 19 more idle templates? Check out the Neon Ultimate Idle Pack (20-in-1) on my profile.

Try it in your browser — buy the full source code for only £1

Auto-fight dungeon monsters, earn gold & XP, level up your hero, hire allies, and push deeper into randomly scaling stages.

Single-file HTML/CSS/JS – easy to edit, rebrand, and resell.

Idle Dungeon Fighter is a complete single-file HTML5 idle dungeon engine.
Your hero auto-attacks enemies, gains XP, collects gold, hires allies, and upgrades their stats while progressing through ever-scaling dungeon stages.

Everything is built in one clean HTML/CSS/JS file with zero external assets, making it perfect for rebranding, modding, and turning into your own game.

⭐ Core Features

• Hero auto-attacks enemies over time

• Enemy stages & chapters with HP scaling

• Hero XP, leveling, and stat growth

• Gold & XP rewards, affected by kill chain bonuses

• Allies system (passive auto-DPS)

• Click attack button for manual damage

• Battle log feed

• Scaling difficulty, with new dungeon chapters unlocking

• Single-file HTML/CSS/JS (easy to modify)

🛠️ Customisable Everything

You can change:

✔ Enemy names
✔ Hero stats & scaling
✔ Damage values
✔ Ally DPS
✔ XP requirements
✔ Gold rewards
✔ UI layout, colours, fonts
✔ Upgrade costs & effects
✔ Stage/chapter progression

All in one simple file.

💡 Suggested Uses

• Idle dungeon games

• Incremental RPGs

• Clicker combat systems

• Upgrade engines

• HTML5 learning projects

• Games you want to resell

• Small dungeon side-games for bigger projects

📁 Includes

idle-dungeon-fighter.html
→ Single-file HTML/CSS/JS idle dungeon engine with auto-battle, leveling, allies, upgrades, and progression.

1. Try the demo above — if you like it, the full source is just £1.