You've ended up in a dark space full of platforms. Slowly you go down, so you'll have to keep on jumping to higher platforms, to stay out of danger. Try to climb as high as possible using your hook, and stay alive as long as possible! Collect treasures by jumping on top of coffers, and also jump on top of monsters. Collect little chickens to win back lost lives. You can also collect bonuses, like a 'longer hook' or a 'rocket'. These items can always come in handy. Have fun!
Use the left and right arrow keys to move. Press the up arrow or Z to jump. Press X to launch your hook.