Stack-Up (Robot Block) is a minigames collection developed for the Nintendo NES in 1985. The game's main objective revolves around completing a series of short, timed challenges that test reflexes and pattern recognition. Players navigate through various levels where quick thinking and precise movements are essential to progress.

The pace of Stack-Up is brisk, with rapid transitions between mini-challenges that maintain player engagement. Each minigame introduces a unique mechanic, such as stacking blocks or maneuvering objects under time constraints, requiring adaptability and focus. The gameplay centers on clearing stacks of blocks by matching colors or shapes, demanding both speed and accuracy.

A distinctive feature of Stack-Up is its incorporation of multiple gameplay styles within one title, offering variety uncommon in NES games of its era. The unusual idea of combining puzzle-solving with action-oriented tasks creates a dynamic experience that challenges players in different ways throughout the game.