Progressive Enhancements During the Session
The progressive design of the Immunization Session is its most compelling part. It’s not a standard free spins round. Instead, it often utilizes a tiered system. For instance, with every cascade or after a few spins, the power of the key symbol might grow. It could extend to cover more spots on the reel, or its multiplier might rise. This develops a story within the bonus itself. The tension rises as the session goes on. The result is a bonus round with a defined upward path, giving you several chances for a big win instead of just one.