Vex and the 15 Orbs

Vex is a Yellow Berserker who goes out on an adventure to find 15 Orbs. His rivals are random Spearmen who just wander around, unaware of the fact that they can suffer from Vex's fireballs. Every five levels, you find levels that have zigzags in the path. You'll find text that reads, "This is a real showdown!" They contain many Spearmen rivals. At the end, you have to collect 5 orbs in one level. After that, you take a red gem as your reward.