Monster Tower

I saw a screen that said teleport to Monster Tower. I say why not. Then I appear in a tower full of monsters. So I grab a dagger in my inventory and it starts. I see a L1 zombie and I go jump over it and stab it. Then I'm like how did I do that. I see 3 more and without thinking I take them out in seconds. I get a notification saying I leveled up to L2 and I received 10 monster coins and a skill point. I spend my skill point to unlock multi attack to attack 2 enemies at once. I was about to go kill more zombies when I see another player.