Games like Main Assembly

A sandbox construction and programming game where players build and test robots in custom obstacle courses. It offers creative freedom with visual programming and collaborative or solo challenges.

83% positive from 1,344 · 2021 · Steam Deck Playable · $19.99 $1.99 -90% · Lowest ever $1.99 (2025-12-04)

3DOnline Co-Op Co-opSingleplayerSandbox Building

Six games like Main Assembly

Finnish Cottage Simulator

94% positive from 3,514 reviews20241% finish itDeck Playable

Life simulator with crafting and business management. Core loop involves resource gathering, production, and selling illegal goods. Relaxed, rural, and slightly criminal feel.

What players likedPlayers praise its authentic, immersive, and detailed simulation of Finnish cottage life, offering both relaxing and chaotic experiences.

The catchGame-breaking bugs strand quests, items vanish, and saving is unreliable or missing.

Both are tagged Online Co-Op, 3D and Simulation.

Games like Finnish Cottage Simulator →

Vellum

90% positive from 1,426 reviews202519% finish itDeck Playable

Vellum is a co-op literary roguelike where players use colored ink-based spells to battle enemies and save books. It features dynamic adventures with synergistic spell combinations and unique Tome mechanics.

What players likedPlayers praise Vellum as a unique roguelike with deep build variety, fun co-op, and Borderlands-like action, often compared to Inkbound.

The catchRuns get repetitive fast because movesets, enemies and build variety are limited.

Both are tagged Online Co-Op and 3D.

Games like Vellum →

Oddsparks: An Automation Adventure

84% positive from 2,247 reviews20252% finish itDeck Verified

Automation and RTS game where you manage Spark traffic to build workshops and explore worlds. It features cooperative play and a cozy village growth element.

What players likedPlayers praise this charming automation game as a cute, engaging factory builder with rewarding logistics, similar to Factorio.

The catchFetch quests and constant back-and-forth running

Both are tagged 3D, Building and Co-op.

Games like Oddsparks: An Automation Adventure →

Tinkerlands

86% positive from 3,898 reviews202529% finish itDeck Verified

A cooperative survival crafting game with island exploration and NPC settlement building. Players gather resources, craft items, and fight bosses in a colorful, magical world.

What players likedPlayers praise Tinkerlands as a fun, addicting "tropical Core Keeper" or Terraria-like with great exploration, bosses, and QoL features.

The catchBugs and crashes are frequent, and multiplayer especially loses progress and items.

Both are tagged Online Co-Op, Sandbox and Simulation.

Games like Tinkerlands →

Plasma

90% positive from 1,113 reviews2023Deck Unsupported

A sandbox engineering game with free-form building and visual programming. Players create and share complex devices and worlds.

What players likedPlayers praise its insane creation potential and community, similar to other indie games with user-made content.

The catchDevelopment was abandoned, so the remaining bugs and missing parts will never be fixed.

Both are tagged 3D, Sandbox and Building.

Games like Plasma →

Mars First Logistics

95% positive from 3,664 reviews202525% finish itDeck Verified

This is an open-world physics sandbox game about designing and piloting rovers for cargo delivery. Players build custom vehicles to overcome Mars' challenges and expand infrastructure.

What players likedPlayers praise its creative engineering puzzles and vehicle building, often comparing it to Kerbal Space Program or Lego Technic.

The catchDeliveries turn fiddly as loose cargo spills and your rover flips over constantly.

Both are tagged 3D, Building and Co-op.

Games like Mars First Logistics →

More like this: Building Online Co-Op Co-op Sandbox

More about Main Assembly

What players liked

Players praise this free-form vehicle building game with logic and programming, comparing it to Trailmakers for its accessible yet deep gameplay.

The catch

Development stopped years ago, leaving the game unfinished with no further updates.

Reviews: 83% positive from 1,344
Released: 2021
Steam Deck: Steam Deck Playable
Price: $19.99 $1.99 -90% · Lowest ever $1.99 (2025-12-04)
Play: Single-playerCo-opMulti-playerPvP

It is here because it sits in the band this site looks at: well reviewed at 83% positive, but with 1,344 reviews, far fewer than the household names carry.

View Main Assembly on Steam

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