This is a guideline on how to activate the boosts: Step 1) On your hood activate 2 boosts, example, def and mafia boosts Step 2) from the group wall, open the boss you want to hit, you may want to open 2-3 bosses.. Step 3) On your hood activate the boost you want, XP, attack or XP.. Step 4) go to the boss you want to hit and activate a boost from your collection, or purchase from the store... Be aware, it doesn't work always with 12%... Step 5) go the the next boss and activate a different boost, XP for example.. Shoot the boss.... You will see that you will have 5 boosts, or 4 if you did not activate a boost on 2nd Boss. Be aware, DO NOT USE YOUR LAST SHOT IF YOU USE BOOST with limited number, 10-15-30... Just replace them with new boosts... It works better if you have long durations boosts, example, 24 Hr def, 24 Hr attack, 4 Hr Loot and 70 mafia....