Game review
Mauja
7.5 / 10
- Developer
- Viktor Uhryn and Pavlo Genov
- Publisher
- Independent
- Released
- 1 January 2017
- Platforms
- Web browser (desktop and mobile)
- Genre
- Arcade / endless roller
- Monetisation
- Free, no ads and no in-game purchases
- Players
- Single-player only
The short version
Mauja's premise is a single sentence — a stray snowball rolls down a mountain, and a tap anywhere drops a trampoline to bounce it over whatever's in the way — and js13k's own 2017 judges responded to it about as warmly as this shelf ever sees, placing it 15th of 100 entries with comments ranging from "Beautiful!" to "Absolutely wonderful!" Nine years on, the art still earns that reaction: a shifting day-night cycle over layered mountain silhouettes, confirmed directly in this review rather than taken on the judges' word. The single-tap control scheme is exactly as touch-friendly as its premise suggests, confirmed by actually playing it — taps registered cleanly and the distance score climbed with each one, on both a simulated phone and a desktop browser, with zero page errors either way. The one real weakness, flagged plainly by a judge at the time and still true, is that a big bounce hands control of where you land to the camera rather than the player, which undercuts the sense that skill is what's improving your score.
Biggest strengths
- The single-input premise is real: tap anywhere to drop a trampoline under the rolling snowball, confirmed directly in this review by playing it — each tap registered cleanly, the distance score climbed correctly (10m to 23m across a short test run), and it behaved identically on a simulated phone touchscreen and a desktop mouse, with zero page errors on either
- A shifting day-night lighting cycle over layered mountain silhouettes is the game's signature and it holds up: multiple independent js13k 2017 judges singled it out by name as the highlight ("I love the day/night cycle!", "Loved the daytime/nighttime transitions"), and this review's own screenshots confirm the same shifting palette in testing
- A genuinely distinctive premise for the genre — a physics-based rolling snowball with a trampoline-placement mechanic isn't a clone of an established endless-runner format, and it reads as its own idea rather than a reskin
Biggest weaknesses
- A specific, credible design critique is on the permanent record from a 2017 judge, and nothing about replaying it in 2026 makes it less true: a big trampoline bounce hands control of where the ball lands to the camera rather than the player, so a strong bounce can feel like luck rather than a reward for good placement
- Interface is minimal to the point of bare: the only on-screen information during a run is a distance counter, with no visible guidance on strategy, upcoming hazards, or how trampoline placement actually interacts with the physics — everything a player learns, they learn by trial
- The same judge who praised the day-night cycle also named the honest limit on replay value: beyond curiosity about how far a single run can go, there's little pulling a player back for a second session
Who it's for: Anyone who wants a beautiful, low-pressure few minutes on a phone, more for the art and the day-night cycle than for competitive high-score chasing
Our recommendation: Worth playing for the presentation alone, and the single-tap control genuinely holds up on a real touchscreen
7.5 / 10
Some js13k entries win on a clever technical trick; Mauja won its audience on atmosphere. The pitch is one sentence — two kids' stray snowball starts rolling down a mountain, and it's the player's job to keep it rolling by dropping trampolines under it — and what elevates it past a dozen similar physics-roller jams is a shifting day-night lighting cycle that every judge who reviewed it in 2017 mentioned by name. Playing it again nine years later, that reaction still makes sense.
A single tap, confirmed rather than assumed
The entire control scheme is one action: tap anywhere on the screen and a trampoline appears under the snowball's current position, bouncing it up and over whatever's in its path — kids, bears, foxes, rocks. Rather than take the author's own description at face value, this review tested it directly: on a simulated 390x844 touchscreen, a tap correctly registered every time, the on-screen distance counter climbed with each successful bounce (10 metres to 23 metres across a short run), and nothing in the console or page ever threw an error. The same held on a desktop browser with a mouse. Reading client.js confirms why it's this reliable — there's no platform-specific gate, no user-agent check disabling anything, just one input path shared by every device.
The art earns its reputation
The day-night cycle is genuinely the thing to see here: layered mountain silhouettes shift through a warm dusk palette into a cooler night tone and back, and it's confirmed directly in this review's own screenshots rather than repeated on faith from old comments. It's also not a minority opinion nine years on — every visible judge comment from the original 2017 competition calls it out specifically, from "I love the day/night cycle!" to "Absolutely wonderful! I love the art style." js13kgames.com's own scoring backs that reception with a real number: 15th of 100 entries in that year's Overall category, a genuinely strong placement rather than a curiosity.
Where the reception was more honest
Not every comment on record was pure praise, and the most detailed one holds up as a fair critique rather than nitpicking: a big trampoline bounce sends the camera chasing the ball, and where it lands afterward often comes down to circumstance more than the trampoline's placement. That same judge put their finger on the game's real replayability question too — past the initial curiosity of seeing how far one run can go, there isn't a strong mechanical hook pulling a player back for a second attempt. Neither complaint is contradicted by playing it again now; both are still accurate.
The verdict
Mauja is a short, good-looking, easy-to-recommend few minutes rather than a game built for repeat sessions, and it's honest about that trade-off rather than padding itself out. The single tap does exactly what it promises, confirmed directly rather than assumed, and the presentation that won over a room of judges in 2017 hasn't lost anything in the years since.
Pros and cons
Pros
- The single-input premise is real: tap anywhere to drop a trampoline under the rolling snowball, confirmed directly in this review by playing it — each tap registered cleanly, the distance score climbed correctly (10m to 23m across a short test run), and it behaved identically on a simulated phone touchscreen and a desktop mouse, with zero page errors on either
- A shifting day-night lighting cycle over layered mountain silhouettes is the game's signature and it holds up: multiple independent js13k 2017 judges singled it out by name as the highlight ("I love the day/night cycle!", "Loved the daytime/nighttime transitions"), and this review's own screenshots confirm the same shifting palette in testing
- A genuinely distinctive premise for the genre — a physics-based rolling snowball with a trampoline-placement mechanic isn't a clone of an established endless-runner format, and it reads as its own idea rather than a reskin
- A real, well-regarded result rather than an obscure entry: js13kgames.com's own scoring places it 15th of 100 in the 2017 Overall category, with every visible judge comment on record landing somewhere between positive and enthusiastic
- No mobile-specific gate of any kind found in the source, and no analytics beacon either — the same simple `client.js` runs the game for every visitor regardless of device
Cons
- A specific, credible design critique is on the permanent record from a 2017 judge, and nothing about replaying it in 2026 makes it less true: a big trampoline bounce hands control of where the ball lands to the camera rather than the player, so a strong bounce can feel like luck rather than a reward for good placement
- Interface is minimal to the point of bare: the only on-screen information during a run is a distance counter, with no visible guidance on strategy, upcoming hazards, or how trampoline placement actually interacts with the physics — everything a player learns, they learn by trial
- The same judge who praised the day-night cycle also named the honest limit on replay value: beyond curiosity about how far a single run can go, there's little pulling a player back for a second session
- No stated licence anywhere in the repository or its frozen competition mirror — genuinely a jam oversight rather than a reservation of rights, but it means this is hosted on credit alone rather than a real grant