It’s not just Japan that’s wary of shelling out for Super Mario Run. The game is sinking on sales charts around the world. It fell 14 places in Hong Kong and four places in the US. Negative reviews are piling up in key markets. In the UK, it has over 2,500 one-star reviews compared to 944 five-star ones. In Japan, it’s 3,577 one-stars to 1,056 five-stars.

App Annie and Sensor Tower estimate that Super Mario Run made between $16 million and $21 million in its first four days. That’s a conversion rate of between 4% and 8%. That rate is unlikely to improve, given the game’s huge number of downloads. Nintendo will now look to two remaining catalysts to boost its fortunes: a launch on Android smartphones (that’s coming “at some point in the future,” according to Nintendo), and a launch on China’s App Store.

Meanwhile, Nintendo’s stock is leaking value, down more than 19% in the six days since Super Mario Run launched. Even a heroic, super-powered plumber would have trouble fixing that.

📬 Sign up for the Daily Brief

Our free, fast, and fun briefing on the global economy, delivered every weekday morning.