The original Famicom version of the game known in the West as Dr. Jekyll and Mr. Hyde. The original version has a different stage order when compared to the international version, and it is also more difficult.
Argus is a vertical shooter by Jaleco and conversion of an arcade game originally released in 1986. The players takes control of a space-fighter equipped with a front laser gun and ground bombs. Although the game features power-ups, they follow an unusual and unique formula - tiles on the ground must be destroyed in order to upgrade the main weapon or trigger special events. However, three of these tiles must be destroyed to activate such power-ups - B creates a temporary barrier around the ship,P upgrades the primary weapon and L gives the player an extra bonus at the end of each stage. Another interesting twist to the game is the Uoru armor; a shadow sometimes appear on the ground and if the player aligns his own shadow with it, then the ship transforms into a powerful robot for a short amount of time. Each stage ends with the same boss battle; a large Mega Argus fortress with a slow flashing core at its center, and the only way to destroy this pernicious mothership is to bomb its core when it is fully exposed. A
The Japanese version of NES Dragon's Lair had a major overhaul in quality, being the fastest version of the game. It also has changes in level design to make the bosses less easier to be cheated.