In this particular challenge, there is a horrible glitch. If you complete this challenge without losing a single bag, your score to read as 0 bags, making it impossible to unlock the Veiled SWAT character. If you already unlocked him and complete with 0 bags afterwards, your unlocked Veiled SWAT will no longer be unlocked and removed from your account. You will receive the message again that you unlocked something which actually means the opposite.