GUI-based drawing programs of its time. geoWrite is a word processor for GEOS. It had a GUI and supported many different styles and fonts with the WYSIWYG principle, unlike the other word processors on the C64. UIFLI (Underlay Interlace Flexible Line Interpreter) is a graphics mode on the Commodore 64 invented by DeeKay and Crossbow of Crest in 1995. Games By 1985, games were estimated to make up 60 to 70% of Commodore 64 software. Due in part to its advanced sound and graphic hardware, and to the quality and quantity of games written for it, the C64 became better known as a gaming and home entertainment platform than as a serious business computer. Its large installed user base encouraged commercial companies to flood the market with game software, even up until Commodore's demise in 1994. In total over 23,000 unique game titles exist for the Commodore 64. International Soccer was Commodore's best first-party game; otherwise "the normal standard for Commodore software is mediocrity", InfoWorld stated in 1984. The company did not publish many other games for the C64, instead releasing game cartridges primarily from the failed MAX Machine for the C64. Commodore included an "Ultimax" mode in the Commodore 64's hardware, which allowed the computer to emulate a MAX machine for this purpose. However, aside from the initial Commodore cartridges, very few cartridge-based games were released for the Commodore. Most third-party game cartridges came from Llamasoft, Activision, and Atarisoft, however some of these games found their way into disk and tape versions too. Only later, when the failed C64GS console was produced, did cartridges make a brief comeback, including the production of a few more cartridge-only games. Crackers managed to port these games to disk later on. While the 1541 floppy disk drive quickly became universal in the US, in Europe it was common for prepackaged commercial game software to either come on floppy disk or cassette-tape format, and sometimes both. Cassette-based games were usually cheaper than their disk-based counterparts; however, due to the Datasette's lack of speed and random access, many large games (such as role-playing video games) were never made for the cassette format. Despite this, a great deal of software was published only on the cassette format in Europe, including many "budget" games produced by companies like Mastertronic, Firebird, and Codemasters which were released on cassette only and sold for a fraction of the price of