Monster Merge: Legends Alive is a merge game in the Suika subcategory that features a dark monster theme. In an elevator box, the player merges different types of monsters (i.e., pulsing masses, spiders, flying demon skulls and skeletal centurion soldiers) to evolve the creatures into ever more advanced and wicked monsters. The player also attempts to earn a high score or, during replay, beat their last-best score.
The game begins with two doors opening to reveal the elevator interior. A glowing white skull rests in the position indicator spot above the box. Instead of providing the elevator's location in reference to other floors, this area serves to show a brief preview of the next monster that the player can drop into the box. Each monster appears inside of a bubble.
The player performs merges by dropping one monster bubble atop another matching one they previously dropped in the box. To aim a drop, they can use their cursor alone or double targeting rings. During a merge, both bubbles burst into smaller skull-shaped bubbles, a new monster appears, and a bubble forms around it. The player tracks their score in the upper-left corner.�
Monster Merge: Legends Alive flashes red across the screen if the player stacks the bubbles too high. If they bypass a red laser line, they lose. They then receive two more chances to attempt to beat their last score.
