You’re looking for adventure.
Cross the bridge and on the other side look around. Not much to do so walk to the right. There’s a monster. Talk to the monster and ask if there’s a way to pass. He’ll let you if you can take the treasure from the dark cave. He’ll give you a FLASHLIGHT.
Walk to the left and use the flashlight on the cave to discover that there are no batteries in it. On the bridge on the left there’s a nail sticking out of a plank. Take the NAIL first, then pick up the PLANK. Walk to the right to return to the monster. In your inventory use the plank on the nail to create a weapon and use it on the monster to kill it. You can now pass to the right.
Game source: A copy of the game was found here on the internet.