Game Information

Developer: SZ Games

Rating:

4.1/5

Released: April 2024

Last Updated: June 2025

Technology: HTML5 (Unity WebGL)

Platform: Browser

Size: ~15 MB

Plays: 5,085

Mobile Support: No

About Mars Underground

Step into the bizarre and whimsical world of Mars Underground, an indie adventure that thrives on unpredictability and quirky charm. Set in a looping day on a not-so-distant planet, this narrative-driven browser game whisks you through a landscape brimming with oddball characters, deadpan humor, and the kind of mysteries that tug at your imagination. Each day begins anew, offering countless chances to uncover hidden stories, experiment with your choices, and stumble upon secrets as you navigate Mars’ most peculiar town.

Mars Underground’s pixel art style draws you into surfaces that feel both familiar and cosmic, with vibrant color palettes that contrast its melancholy undertones. Find yourself cracking a smile at the witty writing, only to be disarmed by genuinely unsettling moments. Conversations unfold with a cast of unforgettable NPCs—each as eccentric as the town itself—and the nonlinear plot lets you dictate the course of your peculiar odyssey.

Built on accessible HTML5 technology for instant browser play (no downloads, no fuss!), Mars Underground is crafted with indie sensibility: free-spirited, creative, and driven by narrative surprises. The easy difficulty level opens its cryptic delights to gamers of all skill levels, allowing you to immerse yourself in the story without getting stuck or frustrated.

Whether you’re a veteran indie explorer or just looking to try something refreshingly different, Mars Underground is an invitation to lose yourself in a weird, witty, and deeply human adventure. Discover what secrets the looping day holds, unlock wild endings, and find out why players everywhere call it “highly involving.” Ready to join the strangest day on Mars? Start your adventure free online now!

How to Play

Starting your adventure in Mars Underground is simple yet unforgettable. Launch the game in your browser—no downloads are required. Upon entering the pixelated world, you’ll wake up each day as Mars, the young protagonist trapped in a Groundhog Day-inspired time loop. Use your keyboard to navigate: arrow keys move Mars through the various spaces—his home, school, and the bizarre townsfolk he’ll encounter. Interact with objects or characters using the spacebar or enter key.

At the heart of gameplay is exploration and experimentation. Try talking to every character, examining every odd item, and testing how your choices affect each resetting day. The choices you make lead to different interactions, secrets, and story branches. If you find yourself back at the start—don't worry! Use this to your advantage. Each loop gives you new information and opportunities to unlock deeper mysteries and alternate endings.

Beginner tips: focus first on discovering your surroundings, replay days to explore alternative options, and pay close attention to dialogue—clues are hidden everywhere. The easy difficulty ensures a welcoming entry point for all players, with no combat, intense puzzles, or frustrating fail states. Ready to unravel Mars Underground’s secrets? Start playing and let curiosity guide you!

Controls

mouse

keyboard

Tips & Tricks

Experiment with every dialogue option—different choices unlock new secrets.
Explore every environment thoroughly; many hidden objects trigger unique events.
Pay attention to returned items or repeated conversations—these often change in subtle ways after each loop.
Talk to every character on each day; some only appear after specific actions.
If you get stuck, try performing actions in a different order to alter outcomes.
Note the time: some events trigger only at specific moments in the day.
Seek out the multiple endings! Your findings in earlier loops shape your available conclusions.

Game Features

Groundhog Day-style looping days filled with experimentation and discovery.
Acclaimed dark humor and emotionally resonant writing.
Colorful pixel art and atmospheric, original soundtrack.
Quirky, memorable characters packed with personality.
Narrative-driven gameplay with multiple endings to uncover.
Instant browser play—no installation, free on itch.io.
Approachable difficulty, perfect for both casual and indie fans.

Frequently Asked Questions

Is Mars Underground really free to play online?

Yes! Mars Underground is completely free to play in your browser via itch.io. There are no hidden fees or downloads required, making it easy to jump in and experience the full game. If you enjoy it, consider supporting the developer by checking out their new projects!

How do I unlock different endings in Mars Underground?

The key lies in experimentation. Your choices during each loop change the outcome of the story. Talk to different characters, try alternative actions, and pay attention to how your environment responds. The game rewards curiosity and replaying days with new perspectives!

Can I play Mars Underground on my mobile device?

Currently, Mars Underground is not optimized for mobile devices. The best experience is on desktop browsers, where you’ll have smooth controls and full access to all the game’s features.

What makes Mars Underground unique among indie games?

Mars Underground stands out with its looping day mechanic, sharp deadpan humor, and a blend of oddball surrealism and sincerity. It’s not just about puzzles or action—it's a story-rich experience driven by choice and discovery. Every playthrough offers something new to unfold.

Do I need any special software or account to play?

No special software or account is needed. Just open your preferred desktop browser, go to the itch.io page, and you’re set to play instantly. All progress is self-contained, making it hassle-free for all players.