Friend, afford me a moment to correct a longstanding misgiving here. What you are mentioning as “Osu!” is in fact, osu! with a lowercase ‘o’. This is a deliberately stylised choice undertaken by the game’s Australian developer, Dean “peppy” Herbert in an apparent throwback to his colloquial omission of proper grammatical case during online conversations. This has carried across to many features in the game itself, including the four derivative game modes (osu!, osu!taiko, osu!catch and osu!mania, if you weren’t aware), plus the development branch titled as ‘lazer’, and even the progression system known as ‘performance points’ (or pp for short). Many people less familiar with the game tend to incorrectly assign the wrong (albeit semantically correct) case to the game, referring to it as “Osu!”, “Osu” or in some cases, even “OSU!”. Osu! would be a better reference to the game’s original inspiration, a Japanese-developed rhythm game for the handheld Nintendo DS console titled Osu! Tatakae! Ouendan. Please respect the developer’s artistic choice and refer to the game by its correct labeling, which is again, a lowercase ‘osu!’ with three letters and an exclamation mark.