8. The Importance of Gems
You should know by this point that free-to-play mobile games have some sort of in-game currency you can buy with real-world cash. If you're in for the long haul as far as collecting new characters is concerned, then you won't need to get your hands on any gems. But for everyone else who's impatient and just wants those new heroes ASAP, you'll have no choice but to cop some gems. These gems are converted into gold, which in turn can be used to add more heroes to your stable. Keep in mind that more Marvel characters will be added to the game at a later date, so stay tuned.
Head to the next page to find out the advantages of finishing off those in-game promos!