Previously on Mobile Monday: mobile games! Currently on Mobile Monday: mobile games! The future of Mobile Monday: ultra mobile games you can play on your ocular implants!

Hard Lines (universal) - Attention everyone who loves the classic arcade game Snake: Hard Lines is Snake times one billion! Guide Lionel, the glowing yellow line, through several game types as he undertakes epic tasks such as killing all of the other lines, collecting glowing light things, and just generally not crashing into anything. It's classic Snake mixed with the lightcycle game from Tron with a whole lot of style and twists and turns, and you'll have a hard time putting it down.

Velocispider (universal) - In addition to being the scariest thing you could imagine finding in your bathroom late at night, Velocispider is also the lone defender of a trio of endangered araknasaur eggs. Armed with an auto-firing gun, tilt your iOS device left and right to slide along the bottom of the screen, shooting at the aliens above Space Invaders-style. On occasion you'll pick up a nice power-up that temporarily boosts your firepower, but other than that, it's just you and a seemingly endless supply of aliens. Protect those eggs! The free Velocispider Zero is also available.

4Towers (iPhone/iPod Touch) - It's been several years since the first big breakout browser tower defense games started capturing big audiences. The genre has rolled along just fine on the mobile platform, featuring some very stylish interpretations of the strategic genre. As 4Towers wants to prove, you can also have an interesting story to go along with deep, customizable gameplay. Start with a few basic towers defending your base from creeps. Then, when the terrain allows it, combine units to form brand new towers that do some wonderful, wonderful things. It looks great, plays well, and gradually increases the complexity to keep you hooked wave after wave.

Orbital Slingshot (universal) - Every space-based game of orbital gravity physics (see Gravitee Wars for a fine example) rolled into a lovely mobile package, Orbital Slingshot is two parts puzzle, one part arcade game. Your overall goal is to aim a probe and fire its sensors at nearby objects, picking a spot to fire at and adjusting your target to compensate for gravitational pull of the planets. It's never as easy as it sounds! Featuring six modes of play ranging from "hit the planet with the beam" to "try to almost hit planets with the beam" and well beyond, there's plenty of strategy and plenty of arcade action to be had in this tense game. Orbital Slingshot FREE is also available.

NOTE: Games noted as 'universal' have been designed for iPod Touch, iPad, and iPhone devices alike. Any game not listed for iPad will work on the system, but native full screen will not be present. Games listed may not be available outside of North America. Prices are subject to change and are therefore unlisted. Please see the individual game pages for purchasing info.