In some games, the trajectory of a jump is fixed, but others it can be altered in mid-air. Falling from considerable height often causes damage or death. Many platform games have environmental obstacles which kill the player character upon contact, such as lava pits or bottomless chasms.[5] Through the various areas of the game world, player may be able to collect items and powerups that can come in handy for different situations, and give the main character new abilities for overcoming adversities.