Gems Stones Saga have two modes Arcade and Classic. How to play 1. Just swap one gem with nearby gem to form a horizontal or vertical chain of three or more identical gems. 2. Tap the first gem and then tap the gem you want to swap with. If the swapping is correct, they will swap and the chained gems will disappear. 3. Bonus is given when more than three identical gems are formed. Sometimes chain reactions, called cascades, are triggered, where chains are formed by the falling gems. Cascades are awarded with bonus points.