There are many other great games out there that contain aspects of Crystalis that you'll probably enjoy if you liked Crystalis (which I assume you do if you are at this site). These games I missed feel free to email me
NES
Battle of Olympus: Ancient-Greek set adventure with similar gameplay to Zelda II The Castlevania Series (I - III): Highly regarded platform/adventure games, though I never really got into them Dragon Warrior I - IV: Classic RPG's, the first of which was the first real RPG on the NES Faxanadu: Same as Battle of Olympus without the Ancient-Greek part Final Fantasy I-III: Again, more excellent RPG's; 2 and 3 were never released in America so you will either have to rely on a translated Rom or their future release on the Wonderswan handheld machine Gargoyles Quest II: Extremely fun and challenging adventure game with excellent graphics Legend of Zelda/Adventure of Link: I think you know about these two Metroid: Great sci-fi adventure game Startropics 1 & 2: Good adventure games
Genesis
Beyond Oasis
I don't know much about Genesis... except I believe the Phantasy Star series was supposed to be good. Recommendations especially in this category would be helpful
Saturn
Legend of Oasis
Game Boy/Game Boy Advance
Final Fantasy Adventure: Similar to Zelda 1, prequel to Secret of Mana Final Fantasy Legend I-III: Good RPG's made by Square Gargoyle's Quest: Never played it but i assume it is similar to the sequel Legend of Zelda: Link's Awakening: Zelda = great Metroid 2: Return of Samus: See Metroid
SNES
Actraiser I & II: Never played either of these games but they're supposed to be good Adventure/RPG's.... made by Enix who made the Dragon Warriors Breath of Fire I & II:Never played it, supposed to be good RPG's Chrono Trigger: Perhaps the greatest RPG ever... if you've never played go out and buy it either on SNES or on Final Fantasy Chronicles for PSX Donkey Kong Country 1-3: Great adventure games with remarkable graphics Dragonview Eartbound:See Breath of Fire Final Fantasy II/4j, 5j, III/6j: Little explanation here.... Final Fantasy 4 in Japan was released as II in America because 2 and 3 for NES were never released. III in America was 6 in Japan because 5 was also not released in America. 5 was eventually released in America as Final Fantasy Anthology along with the rerelease of III/6j. Now for the games.... All are very good RPG's, with 6 being one of my favorite games ever (see Chrono Trigger). The only way to get 5 on SNES is through a translated Rom, but it is now available on PSX. 4 was also rereleased with Chrono Trigger on Final Fantasy Chronicles Illusion of Gaia: 2nd part of trilogy with Soul Blazer and Terranigma(which was also not released in America but is available on a translated Rom). The only one I've played is Terranigma which is a good Crysalis-esque game. Lagoon Legend of Zelda: a Link to the Past: See Link's Awakening for Game Boy Secret of Evermore: Square RPG Secret of Mana: Excellent Adventure/RPG quite similar to Crystalis made by Square Super Castlevania IV: Sequel to NES series; excellent graphics Super Mario RPG: Original RPG that is easy but a lot of fun Super Metroid: See Metroid
Playstation(PSX)
Chrono Cross: Sequel to Chrono Trigger Final Fantasy 7-9: Final Fantasy Metal Gear Solid: Great adventure game Blood Omen: Legacy of Kain
Nintendo 64
Donkey Kong 64: See Donkey Kong Country Legend of Zelda's Ocarina of Time and Majora's Mask: See A Link to the Past