If you find yourself with more danger room discs than missions, then try this. Go to healers den and purchase the missing qualifying exam to advance. Other programs are also available there. After purchasing them, your only problem should be beating the challenge
Once you unlock more than four characters in the game, you can use this to your advantage and prevent yourself from using lots of health and energy packs. If team members die, DO NOT revive them. Instead, select another available character. Also do this for characters that are low on health that cannot heal themselves. After you beat a level, the characters that you did not revive or heal will be revived and fully healed. Never pay to revive as long as you don't mind using the whole team!
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