Cave Story/First Cave

After the introduction cutscene, walk over to the spinning diskette (You can also heal yourself at the first aid station, but you don't need to right now) and save your game. Then go to the door and exit.

Once outside the room, proceed left along the path. Avoid the spikes along the floor, as you are too weak to survive a hit from them. Avoid the bats and critters and proceed along the path until you reach the end. Enter the massive stone lion's head.

Inside the lion's head, talk to the hermit gunsmith if you want, then take the Polar Star from his chest. Follow the path back to where you came. Shoot the enemies if you want for some quick exp or health. Once you reach the save point, you can go back in and save or continue along the path to your right. Shoot out the breakable bricks then defeat the critters. Finally, shoot the cursed door until it dies, then exit the area.