The osu!arcade was a prototype arcade machine created by peppy. It consisted of a custom-made enclosure and a built-in touchscreen running a touch-based version of osu!.
Although it has arcade in its name, features typical for arcade machines like coin slots had been considered but were never added when working on the prototype.1
osu!arcade machine at 2010's Wai-con
For the Wai-con anime convention in Perth in January 2010, peppy wanted to create a showcase for osu! with the goal to make osu! more known in the local community.2 Despite the idea being relatively spontaneous, peppy successfully set up the first prototype for an arcade machine. It was a slanted box with external speakers at the side, running a modified version of osu!(stable).34
Throughout the 2-day convention, peppy tried to get feedback by watching both beginners as well as veterans of Ouendan and Elite Beat Agents play the game.
Many convention visitors wanted to try out the arcade machine, so much so that at most times it was hard to see the screen due to the constant stream of people gathered around the cabinet. Overall, the community acclaimed the arcade machine, although some people pointed out that playing too much could lead to sore fingers.5
Second prototype
Around early to mid 2012, a second prototype was developed.67 It featured two speakers which were integrated into the cabinet. The touchscreen used a precise optical-based system.8 Furthermore, an Arduino microcontroller controlled LED lights that would flash according to the music.910
The prototype was showcased to the public running osu!stream, an osu! variant designed for touch devices, at multiple events such as the "Red Flag LAN Fest" in Perth.1112
In August 2012, support for local multiplayer was added to osu!stream specifically for the arcade.13 Included with the multiplayer mode was a custom server and real-time synced cursors, an exclusive feature not present in any other osu! variant.14
Later that same year, peppy experimented with support for converting osu! beatmaps to osu!stream, so a more diverse range of maps could be played on the arcade cabinet.15
In the following years, peppy did not continue to work on the osu!arcade project. By publishing the design document in October 2013 however, he wanted to inspire others to create their own arcade cabinet or undertake similar projects.
Forum thread by peppy (2010-01-27) "osu!arcade at Wai-con 2010" ↑
YouTube video by shigeru miyamoto (2010-01-23) "osu! at Waicon 2010" ↑
kingking9's osu! profile featuring a lot of pictures of the prototype ↑
YouTube comment by Dean Herbert (2013) in "[osu!stream/osu!arcade] OK Go - This Too Shall Pass" ↑
YouTube video by Dean Herbert (2012-06-03) "osu!arcade lighting #2 (wip)" ↑
Forum thread by peppy (2013-11-01) "osu!arcade design documents" ↑
YouTube video by Dean Herbert (2012-10-17) "osu!arcade @ RFLAN (highlights #1)" ↑
YouTube video by Dean Herbert (2012-09-19) "osu!arcade @ OneUp Microcinema" ↑