Power Ups

Ayolabi12345

How would I make power ups in the game that can:

Make it invincible

and another that makes it double jump (I use the jump only once template)

ookami007

You need to set attributes... I'm guessing invincible would be limited and double jump would be permanent.

So, playerInvincibleTimer and set it to 0

When the player picks up the invincible powerup, set the playerInvincibleTimer = timer + 3 (that gives 3 seconds of invincibility so set it however long).

In your routine for collissions with harmful objects (enemies, bullets, etc), put them all inside of a rule that says IF playerInvincibleTimer < timer then do the collision checking, normal stuff that happens.

For the double jump, there are plenty of tutorials on that:

jamie_c

I have a tutorial about power ups you might want to check out. It includes double jumps and a shield. But the tutorial is also good for the overall idea of how any power up might function.