Give problems as a present

Bring new impetus into the carefree daily round of your friends. Be it an anniversary present, Christmas present, or just a present on the spur of the moment.
A unique present with which you can prove your creativity.

Simply give a few problems as a present!

E-Mail address of the friend: number

trivial problem
simple problem
normal problem
difficult problem
nearly unsolvable problem


An e-mail with the link to the problem will directly send to the e-mail address of your friend.