UDONGEIN X

Side-scrolling action platformer with bullet dodging and boss-specific mechanics

Bar Holographic Otaku · Published by Bar Holographic Otaku, 东游鉴 · Released Dec 3, 2021

Reviews: Very Positive; 92% of 462
Recent reviews: Not enough recent
Players: 1; daily peak, Oct 28, 2026
Steam Deck: Playable
Last update on Steam: 3 years ago; Nov 20, 2022
Minimum PC: Shader Model 3.0 compatib…; 0.1 GB RAM · 0.1 GB disk; Full requirements

What is UDONGEIN X?

You play as Reisen in a single-player, side-scrolling action platformer set in Gensokyo, rescuing Moon Rabbits after a crash landing. You jump and shoot through stages, dodge bullets, and fight bosses. Items collected from stages and bosses fund optional upgrades, including more health and abilities that clear bullets from the screen.

For you if...

+you like Mega Man-style action and Touhou characters
+you enjoy boss rushes with perks between fights

Not for you if...

−you want a lengthy campaign rather than a short playthrough
−you expect to change difficulty without restarting your playthrough

What players say

92% of 462 reviews are positive

Players praise the jumping and shooting, and some highlight the boss fights. Recent reviews criticize uneven difficulty and limited weapon and upgrade variety.

Screenshots and trailer

UDONGEIN X system requirements

Minimum: Shader Model 3.0 compatib…, 0.1 GB RAM, 0.1 GB of disk space.

As published by the developer.

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Minimum

OS: Windows Vista, 7, 8, 10
Processor: Intel Core 2 Duo
Graphics: Shader Model 3.0 compatible
Memory: 128 MB RAM
Storage: 70 MB available space

Does UDONGEIN X have co-op or multiplayer?

No: single-player only, no multiplayer modes declared.

Single-player

Does UDONGEIN X run on Steam Deck?

Playable Playable: it runs on Steam Deck with some adjustments.

Native resolution not supported
All functionality is accessible with the default controller configuration
In-game text is legible on Steam Deck
Default graphics settings perform well on Steam Deck

PC version details

DRM: None declared on Steam
Controller: Full controller support
Platforms: Windows
Achievements: 17
Steam features: Family Sharing
Languages: Text only: English, Japanese, Simplified Chinese, Russian, Spanish - Latin America.

Does UDONGEIN X use AI-generated content?

No AI-generated content is disclosed on the game's Steam page.

Self-reported by the developer under Steam rules: it covers AI content that ships in the game, not tools used to make it. Steam page checked on Oct 27, 2026. How to filter AI games on Steam