Punch is an attack used by Knuckles the Echidna in Sonic Boom: Shattered Crystal. When using it, Knuckles delivers a powerful punch.
Description
When using this technique, Knuckles delivers either a full-powered uppercut or a downward strikes with his fist while moving slightly forward. This attack is powerful enough to instantly destroy enemies that would otherwise require multiple hits to be destroyed. To use it in gameplay, the player has to press 
.