You start Stage 4 in a forest.
Two new enemies are present. The first is an animal that runs along the ground and charges. The second is a ninja that transforms into fire before charging at you.
The ninjas carrying swords have learned a new tactic. After their leap attack they will crouch to make their melee swing. To hit them, crouch and attack before their sword connects.
Boss[edit]
The boss for this stage enters wearing armor. When unarmed, he is difficult to hit, and you best tactic involves using jump kicks and retreating when you connect. He will retaliate against attack, either by a quick attack, or by stepping back and spinning before launching a long kick.
If you have a weapon, attack as soon as he enters range, and evade by jumping up or down. If done properly, he will be injured, and his retaliatory attack will be against air.