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Since TTI understood that the price was too high for many people in their target market, they included a booklet of coupons for TurboDuo games and accessories, plus several pack-in games on two CD-ROMs: "Ys Book I &amp; II" (1990) and a Super CD compilation of four of Hudson Soft's more popular TurboGrafx-16 titles: "Bonk's Adventure" (1989), "Bonk's Revenge" (1991), "Gate of Thunder" (1992), and "Bomberman" (1983). ("Bomberman" was hidden in an Easter egg.) The package also included one TurboChip game: "Dungeon Explorer" (Hudson Soft 1989). Later, TTI replaced "Dungeon Explorer" with one of a variety of TurboChip titles, such as "Ninja Spirit" (Irem 1988) and "Final Lap Twin" (Namco 1989).