Wall scale - You grab a rope hanging from a top wall and climb over the wall- agility and strength- if you fail you lose your grip and fall back to RS gold the ground in which you might possibly take two damage-you will also need to restart the wall. Metal Ball-You must get a heavy metal ball and haul it over into a switch and place it on the switch that will open a doorway so that you may continue- demands durability - if you fail you may fall the metallic ball, where it will land in your characters foot, making him jump around holding his foot awhile, then pick up the ball again and continue.
Light Wooden plank- You concentrate your equilibrium and make yourself light so that your weight does not violate the plank-agility-if you fail, you will either drop off the plank, or the board will snap in half, sending you to the pool of mud that expects below. Monkey Bars-old fashion playground monkeybars-agility-if you fail, you drop and smack in the ground
Rock Throw-your character throws stones at a switch on a wall above a door, which will open the door-strength-If you fail, the stone just misses and you keep throwing stones until you hit the change. Vine and Zipline-You scale a vine till a stage, where you slip down a zipline-agility and strength-you fail because the vine pops (causing to to fall and take two damage) or once you slip down the Zipline and liquefy full-force into the wall in the conclusion (which induces 3 damage)
I believe F2P deserves a single monster that's at least adequate training and gives some rune and addy drops every now and then, without the chance of cheap RuneScape gold experiencing a rev suddenly appear and possibly own you.