Babel

Ghost Babel follows the overhead 2D format used in the 1990 MSX2 game Metal Gear 2: Solid Snake while adding a few new elements introduced in Metal Gear Solid. As with previous games in the series, the objective is to infiltrate the enemy's stronghold while avoiding detection from guards or surveillance systems. The player can acquire numerous items and weapons to help them fulfill their mission. One difference from the MSX2 game is that the screen now scrolls when Snake moves throughout a single area instead of using flip-screens. Moreover, all the characters in the game now move in eight directions, allowing both the player and the enemies to move diagonally in addition to the four cardinal directions. Snake now has the ability to flatten himself into walls like he does in Metal Gear Solid. By flattening himself, Snake can move across the wall (allowing him access to tight passages that are not accessible by walking), scroll the camera behind his position to scout the area ahead, or knock the wall to lure nearby enemy soldiers. Depending on the difficulty, the number of punches required to defeat an enemy soldier differs; in the higher difficulty levels, the enemy soldiers will be knocked unconscious for a while after the first series of punches instead of simply being defeated. Crawling is now assigned to the Start button (instead of pressing two buttons simultaneously), and the changing of weapons and equipment is done on the main game screen rather than on separate sub-screens. Like in previous installments, the player communicates with various allies via a wireless communication device (the Codec), which is also used to save the player's progress. Unlike the preceding installments, Ghost Babel uses a stage-based structure with 13 total stages. After completing a stage, the player's performance is graded from "Terrible" to "Excellent". Much like in the original Metal Gear Solid, the player's overall performance is graded with a codename after completing all 13 stages, with the codenames varying depending on the difficulty level chosen at the start of the game.