Steam game

Mystery Cube: Black Dragon Jarl

Fantastic Dragons × Rune Swordsman Debut. This casual stress-relief action game is super easy to get into with maxed-out skills and ultra-short cooldowns—so fun you won't want to stop. Say no to heavy tasks! Clearing levels relies entirely on knocking treasure chests away!

$1.39 April 30, 2026

By homallen

Windows
View on Steam
Mystery Cube: Black Dragon Jarl - homallen. Popular. Released April 30, 2026
Screenshot of Mystery Cube: Black Dragon Jarl gameplay showing in-action mechanics Screenshot 2 of Mystery Cube: Black Dragon Jarl - additional gameplay view Screenshot 3 of Mystery Cube: Black Dragon Jarl - more gameplay footage Screenshot 4 of Mystery Cube: Black Dragon Jarl - final gameplay screenshot

Overview

About this game

Say goodbye to heavy tasks and reject grind-induced anxiety. The core gameplay of each level is simple and straightforward—blast the treasure chests and reach the target number to easily complete the level! Various skills and moves can be switched freely, with cooldowns so short there's no gap, offering a smooth, lag-free experience; earning coins is effortless, allowing you to easily unlock more gameplay and items, focusing on stress relief and healing.

Additionally, with a fantastical worldview, mighty and powerful dragons and agile rune swordsmen make a stunning appearance, letting you immerse yourself in unlocking a magical adventure!

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