Jimmy and the Pulsating Mass

Turn-based RPG with monster transformations and a child's nightmares

Kasey Ozymy · Released Aug 7, 2018

Reviews: Very Positive; 93% of 557
Recent reviews: Not enough recent
Players: 2; daily peak, Oct 29, 2026
Steam Deck: Playable
Last update on Steam: 3 months ago; Jul 13, 2026
Minimum PC: 1024 x 768 pixels; 1 GB RAM · 0.3 GB disk; Full requirements

What is Jimmy and the Pulsating Mass?

You play an eight-year-old boy in a single-player, Japanese-style RPG set within his dream, where an alien entity threatens his family. You explore with family members, fight turn-based battles, and take on monster forms that change how you interact with the world. Leveling these forms increases stats and unlocks abilities.

For you if...

+you enjoy searching for secrets and optional dungeons
+you like stories that mix humor with psychological horror

Not for you if...

−you prefer real-time action to turn-based battles
−you want a story without mature or disturbing themes

What players say

93% of 557 reviews are positive

Players praise the story, flexible character builds, and soundtrack. Some recent reviewers describe the combat as grindy.

Screenshots and trailer

Jimmy and the Pulsating Mass screenshot 1

Jimmy and the Pulsating Mass system requirements

Minimum: 1024 x 768 pixels, 1 GB RAM, 0.3 GB of disk space.

As published by the developer.

Can my PC run Jimmy and the Pulsating Mass?

The published requirements do not name a graphics card we can compare.

Set up my PC →

Minimum

OS: Microsoft® Windows® XP / Vista / 7 (32-bit/64-bit)
Processor: Intel® Pentium® 4 2.0 GHz equivalent or faster processor
Graphics: 1024 x 768 pixels or higher desktop resolution
Memory: 1 GB RAM
Storage: 300 MB available space

Does Jimmy and the Pulsating Mass have co-op or multiplayer?

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

Single-player

Does Jimmy and the Pulsating Mass run on Steam Deck?

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

The launcher or setup tool may need the touchscreen or virtual keyboard
Default controller config not fully functional
Sometimes shows mouse, keyboard or non-Deck controller icons
In-game text is legible on Steam Deck
Default graphics settings perform well on Steam Deck
External controllers are not supported for the primary player

PC version details

DRM: None declared on Steam
Controller: Keyboard and mouse
Platforms: Windows, macOS
Steam features: Family Sharing
Languages: Text only: English.

Does Jimmy and the Pulsating Mass 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