Here is the list of secret area locations in Wulverblade game. the Level 8 secret area will update later.
Last screen before the boss, between the stones.
In the burning hut after you kill the enemies.
Same trick as level 2
#1 Immediately following the stone circle fight.
#2 Right before the tower (boss) fight. Follow the path down.
Just before the boss fight. Same trick as level 4, but this time you need to enter a cave. I don’t think the secret registers until you pick up the book inside.
In the tent.
Last screen before the boss fight. It’s the only time you’re prompted to go straight up. Instead, smash the barrels and go right.
Haven’t found any yet.