simplified maze also in 1982. Namco Networks sold a downloadable Windows PC version of Pac-Man in 2009 which also includes an enhanced mode which replaces all of the original sprites with the sprites from Pac-Man Championship Edition. Namco Networks made a downloadable bundle which includes its PC version of Pac-Man and its port of Dig Dug called Namco All-Stars: Pac-Man and Dig Dug. In 2010, Namco Bandai announced the release of the game on Windows Phone 7 as an Xbox Live game. For the weekend of May 21–23, 2010, Google changed the logo on its homepage to a playable version of the game in recognition of the 30th anniversary of the game's release. The Google Doodle version of Pac-Man was estimated to have been played by more than 1 billion people worldwide in 2010, so Google later gave the game its own page. In April 2011, Soap Creative published World's Biggest Pac-Man, working together with Microsoft and Namco-Bandai to celebrate Pac-Mans 30th anniversary. It is a multiplayer browser-based game with user-created, interlocking mazes. For April Fools' Day in 2017, Google created a playable of the game on Google Maps where users were able to play the game using the map onscreen. Technology The original arcade system board had one Z80A processor, running at 3.072 Mhz, 16 kbyte of ROM and 3 kbyte of static RAM. Of those 1 kbyte each was for video RAM, color RAM and generic program RAM. There were two custom chips on the board: the 285 sync bus controller and the 284 video RAM addresser, but daughterboards made only from standard parts were also widely used instead. Video output was (analog) component video with composite sync. A further 8 kbyte of character ROM was used for characters, background tiles and sprites and an additional 1 kbit of static RAM was used to hold 4bpp sprite data for one scanline and was written to during the horizontal blanking period preceding each line. Sprite size was always 16x16 pixels, one of the four colors per pixel was for transparency (of the background). The monitor was installed 90 degree rotated clockwise, the first visible scanline started in the top right corner and ends in the bottom right corner. The horizontal blanking period, which starts after the level indicator at the bottom is drawn, had a duration of 96 pixel clock ticks, enough time to fetch 4 bytes of sprite