The game is called 1v1 lol and it is a building simulator. You can play with other online players which makes it more exciting because you won't be playing against a bot, you'll be up against a real user. Simply download it and all the necessary resources will be stored.

There's also no need to worry about playing on work PCs because this game is unblocked, so you can play it anywhere, even at school.  With this game, you can practice and perfect your battle royal skills without too much effort.