How to Collect TMNT Characters
Each TMNT: Legends character card requires a certain number of DNA before you can unlock it and recruit him/her to your squad. To get DNA, tap a locked character card under Roster and then tap the purple Find button. A new screen will show drop locations. These drop locations provide a list of stages of a chapter that need to be completed to get DNA and a card pack that may contain the DNA of a character.
Once you have completed a chapter in normal mode, you will unlock Hard mode, which lets you collect DNA of locked/unlocked characters. On hard mode, a stage with a characters icon suggests that you can acquire the DNA of that character. When you tap a stage, you will see the character card and below the card are the required DNA and the DNA you have collected so far .
You will get 3 battle chances per stage on hard mode. Chances of acquiring DNA can be possible on first, second or third try, but sometimes, you may not get any and may have to wait for the next set of battle chances to grind for DNA. Try to beat a stage achieving all three shurikens to increase the chances of getting DNA. Once 3 battle chances are over, theres a cool-down time that prohibits players from playing that stage for a few minutes. You can again grind for DNA and get three more battle chances once the cool-down time is over.
The Free card at the Card Shop may also provide DNA of a random character. You may also get DNA of a random character after reaching a new player level.
Use Warp Passes or Auto-Play If You Are Bored Grinding for DNA and Loot
You will have to replay old levels to get items for character skill upgrades. You may also have to replay old levels in hard mode to get DNA. Playing the same level over and over again to grind for DNA and loot can be boring, which is why the game lets you use warp passes to instantly complete stages with 3 stars and instant rewards. You may get warp passes after reaching a new player level and by completing Daily Missions. Tap the mission tab to check for tasks that will get you passes.
Warp Passes are not easy to earn, so why not make use of the auto-play button to let your squad battle enemies on their own. Just make sure you have upgraded all squad members to their max level before auto-playing old stages. The auto-play button is located at the top-left corner of the battle screen. Using auto-play is the best way to speed up battles.