Number 10 on Steam’s Top Sellers chart. Zero user reviews. That’s the stat line for MOUSE: P.I. For Hire, and it’s the kind of anomaly that stops you scrolling.

Fumi Games’ debut launched April 16, 2026, and immediately parked itself alongside heavyweight titles that have review counts in the tens of thousands. The game — a first-person shooter wrapped in 1930s rubber-hose animation, starring a hardboiled mouse detective named Jack Pepper — is priced at $29.99 / €29.99 and published by PlaySide.

According to its Steam page, MOUSE combines “the charm of hand-drawn rubber hose animation inspired by the classic cartoons of the 1930’s with the adrenaline and action of an explosive first person shooter.” Jazz-fueled guns-blazing noir is the pitch, and the art style is unmistakable — it looks like Cuphead’s violent cousin picked up a revolver.

But here’s the real story: a Top 10 chart position driven entirely by pre-launch momentum and day-one purchases, with no user reviews to back it up. No word-of-mouth from early access. No “Overwhelmingly Positive” badge doing the heavy lifting. The game is selling on vibes, trailers, and whatever marketing engine got it there.

Steam’s Top Sellers chart ranks by revenue, not units, so a $29.99 price point helps — but it doesn’t explain cracking the top 10 on launch day without a single player leaving feedback. That takes either a serious influencer push, a trailer that went viral, or a community that was locked in months ago and hit purchase the second the clock ticked over.

Whether MOUSE holds that position once the reviews start flowing is a different question entirely. The art style got it to the dance. The gameplay decides if it stays.

As of this writing, the Steam page shows 0 positive and 0 negative reviews. The chart position is the only signal — and right now, that signal is loud.

Sources