if u buy or recieve a weapon goto the settings click avatar and weapons then choose a weapon that is suitable for your stregnth dex and intel.
foe sift heads no weapon change sift heads two press the right mouse button same for all sift heads
You click the Tab bar on your keyboard
you press up on the directional pad
Sonic doesn't use weapons, except in Sonic and the Black Knight. He only uses a sword. That's about it.