How an original slot game is made: from GDD to release

Every original slot game at Giro Games goes through the same four-step pipeline — and understanding it explains why in-house production beats white-label catalogues for quality.

1. Concept and game design document

A slot starts as a theme worth building around: a character, a world, a mechanic. The GDD fixes the reel layout, feature set, bonus structure and target audience before a single asset is drawn.

2. Math and simulation

RTP, volatility and hit rate are designed as a system, then proven across millions of simulated spins. Our released games ship with RTP between 96.05% and 97.00% — numbers we can defend spin by spin.

3. Art, UI and animation

In-house artists build symbols, backgrounds, UI and transitions as one visual language, optimised for HTML5 and mobile play.

4. Development, release and updates

The game is engineered, tested, certified and released with casino partners — then tuned and updated after launch. That is the difference between shipping a slot and maintaining one.