Sudo as reward

[rokytnji]

but is there a way?

Not remotely and not like game tokens when successful . You either edit /etc/sudoers as a administrator or not.
Now having said that. Anything is possible in Linux when one spends enough time hacking his system.
But that is a personal quest and I don't think someone will write you a

cron job with a monitor for rewards on little brothers box>ssh to notify you/admin  of little brothers success story>
email you of success story so you can remote into little brothers box and edit /etc/sudoers manually.

Although stranger things have happened I guess.

As far as I know. Admin rights are locked down till Admin personally allows rights to other users.
eg:

Code:

littlebrother ALL = NOPASSWD: /sbin/halt, /sbin/reboot