Ket Trilogy, The - Mountains Of Ket (1985)(Incentive) ROM Download for Dragon Data Dragon (). Ket Trilogy, The - Mountains Of Ket (1985)(Incentive) game is available to play online and download only on Roms Games. Ket Trilogy, The - Mountains Of Ket (1985)(Incentive) ROM for Dragon Data Dragon download requires an emulator to play the game offline. This Game is English (USA) Version and is the highest quality available.