Ultimate's first 48K releases were "Lunar Jetman" – a sequel to "Jetpac" – and "Atic Atac," both of which were released in late 1983. Both games were very well received by the gaming press, "CRASH magazine" in particular praising what Ultimate had managed to do with the extra memory Lunar Jetman used. In 1984 came "Sabre Wulf", the first in the "Sabreman" series, and the first release at a recommended retail price of £9.95. The price of Ultimate titles had previously been just £5.50, which was typical for Spectrum arcade-style games at the time. This increase was to discourage piracy, with the idea being that if customers paid more for a game they would be less inclined to give away copies. This coincided with the introduction of the distinctive Ultimate "big box" packaging (used with all further Spectrum releases until "Gunfright", and with various releases on other platforms), which the company felt might also help justify the price increase and encourage gamers to buy the game rather than copy it. The strategy paid off as "Sabre Wulf" went on to sell over 350,000 copies on the Spectrum alone. This was followed by the simultaneous release at the end of 1984 of the next two instalments in the Sabreman series, "Underwurlde" and "Knight Lore". "Knight Lore" was something of a revolution in the home computer game market, using a forced-perspective isometric viewpoint branded Filmation, the style of which would be extensively copied in other games, notable examples being "Batman" and "Head Over Heels" from Ocean Software. "Knight Lore", and some of its Filmation follow-up "Alien 8", was actually completed before "Sabre Wulf" but Ultimate decided that it could have a potentially negative effect on sales of the comparatively primitive "Sabre Wulf", so it was postponed until late 1984 for a simultaneous release with "Underwurlde".