This is a pack with of piranha plants which can go in 4 directions with various options that can be set with the extra bytes/bits.
Extra bit - spit fireballs if set
Extra byte 1 - sets piranha color and the type of piranha
Extra byte 2 - delay for the first jump of the piranha
Extra byte 3 - speed with which the piranha jumps
Note: In the update i added new options, added some comments as well as made the piranha behaviour more accurate to the original ones.