The mystery of the ages has been solved! Today we can get a robot to move up a vertical plane using his grappling hook to attach to floating spheres! And it is terribly addictive too... How high can you go? The original game was fun, but hellish in its expectations and difficulty. Gravity Hook HD is MUCH easier to play. It is also prettier, has a better soundtrack and no doubt hides other gameplay enhancements.

What's better than a game about a shuriken-chuckin', rope-swingin' cyber-ninja with green glowing eyes and powers of invisibility? Two games about that ninja. Final Ninja Zero is Nitrome's prequel to Final Ninja, with a secret weapon that puts it ahead of any other platform game in a browser: cyborg ninja monkeys.

Simplicity reminiscent of an Orisinal game but with visuals and sound you might expect to find in something more old school. Backed by an enjoyable physics engine and a simple but well-executed concept and virtually no down-time, Gravity Hook is a simple, grappling hook arcade game that borders on clinically addictive.

Final Ninja is the latest Nitrome title to be released. It's a side-scrolling action/adventure with plenty of ninja-goodness like wall-jumping, stealth mode and rope grappling. The stealth mode is a pretty fun tactic, as you'll be met with lots of security systems and enemies that will require a delicate touch to overcome. But the grapple is definitely the key mechanic that makes this game shine.

Wik and the Fable of Souls is an engaging action-puzzle classic developed by Reflexive Entertainment. Help guide the frog-like Wik as he swings and jumps using his grapple-like tongue, collecting coins, gems and grubs along the way. Watch out for enemy bugs and shoot them down with an array of objects or other insects you spit from your mouth.

Swinging Ball is a new, fun little flash title developed by Gimme5games. It's a fairly simple ball-physics game, much as we've seen before in which your goal is to guide the ball through a series of obstacles to the exit. What makes Swinging Ball noteworthy is the implementation of a grapple-like rope that you can use to latch onto surfaces and swing around like Tarzan.

The next entry to the 4th Casual Gameplay Design Competition is from Daniel Vandali of Australia. Bounce is an arcade-style action game in which the "ball physics" theme is well represented by the ball objects in play. The objective is to activate all orange balls in play by knocking into them. Your means of control is a grappling hook, and a few different power-ups to aid you. Avoid the walls.

The next entry comes from Russia (with love) by another two-person creative team: Eugene Karataev (Flash developer) and Artem Popov (artist). Jabo is an acronym for "Jump And Ball Operation" and it somewhat describes the basic premise of Eugene's and Artem's action game starring a frog with a very long tongue. Use the frog's tongue as a grappling hook to propel yourself towards the shining star. The rest is up to you.