First, what is a boost slide To put it simply, a boost slide is where you boost, and then slide. This can be done by either boosting on the ground or in the air, and then pressing down and kick at the same time. When should they be used Any time that you can fit one in you should try it. Some good uses:

• Boost slide on the train for metro pass - this will then mean you can jump off the train early
• You need to boost slide in order to beat the biker
• In the sewers you can do lots of boost sliding and bouncing on the spiky enemies to get through it quickly