Watching ads is the fastest way to level up..

▪︎Tower of Challenges Ads (Weapon Enhancement Scroll) You get 2 free tickets daily, so watch 2 ads for the base reward, then use 5 tickets + 5 reward ads for a total of 10 ads. ▪︎Chest Ads Seen While Farming Maps (Money + Gems + EXP) These are pretty good since they give all three rewards at once. ▪︎Attribute Orb Ads These occasionally pop up in the bottom left. Since attribute upgrades require a lot of orbs, watch them when you remember. ▪︎Additional Tip Only watch the ads mentioned above. As for where to spend your accumulated gems: 1. It's better to save up 35K (1350 gems) and use them on the Soul Chest. Aiming for S-rank weapons is more worthwhile after obtaining Mythic or Transcendence heroes from the Soul Chest and when you can afford to unlock at least one skill. Even getting a Mythic hero without skills makes you significantly stronger.