Gem Stack represents Rollic Games' entry into the gem-processing casual game genre, positioning itself among stacking and gate-based progression titles. The game distinguishes itself through its thematic focus on gem transformation, offering a progression system that moves from raw mineral collection to polished jewelry creation. The core gameplay involves navigating gem stacks through obstacle courses while passing through value-enhancing gates. Players break, cut, and polish collected gems across multiple stages, with upgrade systems that allow for equipment improvements and gem quality enhancements. The economic system enables players to reinvest earnings into better processing tools, creating a feedback loop of progression and reward. User interface design employs bright, colorful visuals with intuitive swipe controls for gem stacking and obstacle avoidance. The game utilizes a level-based structure with increasing difficulty curves, complemented by visual and auditory feedback during gem processing stages. Real-world usage patterns indicate short session gameplay, with most players engaging during brief breaks or waiting periods. User feedback consistently highlights the game's addictive progression mechanics while criticizing advertisement frequency. Jesse Blake's July 2023 review notes the fresh take on gate-based games but requests expanded jewelry crafting content. Multiple 2025 reviews from Miranda Fuentes and Life of Random acknowledge enjoyable gameplay while emphasizing frustration with frequent ad interruptions. DeNae LaFoucade's August 2025 review praises the offline capability and progressive reward system. The game demonstrates strength in its core loop of collection and progression but faces limitations in advertisement implementation and content depth. Ideal for casual gamers seeking quick sessions, Gem Stack delivers satisfying mechanics though may frustrate players preferring uninterrupted experiences. The balance between free accessibility and monetization through ads remains the primary consideration for potential users.