What url should be specified in the "Class" widget so that when the user goes to the game, he gets into the game in classmates?

Question

Classmates

What should I set up in the "Class" widget so that the user gets into the game on classmates (without pads) when switching?
When I specify the current URL, it takes the address where the game is located. Then it is proposed to confirm that it goes to an external site. How to remove this pad? There is an option from our site to make a redirect to the game. And if I specify the address of the game itself ok.ru/game/***
as a URL parameter , then when publishing, all information about classmates pops up, and the url leads to the game as it should.