Few questions regarding game, kindly assist

Help please, i am new, few question to ask;

  1. i received this friend uber chest with a code, WBFSJDPKB

dont really understand how to open the chest

  1. i read somewhere on pinned topic with voucher codes, how to use or where to key in the codes?

  2. the latest event, ninja, is it on purpose that if we lose/fail few times, it is impossible to reach the final stage? Or is there any other way?

thank you so much for any replies, appreciate it

IGN : raykhazri

Uber chests can be opened by your friend who can type the code.

If you fail any island impossible to complete all.

read here about vouchers :