Though the main storyline lasts around 10 minutes, you can still have a lot of fun playing this beautiful behind the scenes HL2 game, thanks to challenges. Here are a couple of tough and interesting challenges. The order of challenges are from subjectively... 

This guide is designed to explain the basic mechanics of the game. 

k 

ОГРОМНОЕ сборище различных консольных команд, такого вы нигде больше не найдете (НЕ КЛИКБЕЙТ). 

can't jump? Here's how