The Next Floor is an interesting blend of side-scrolling action game and tower defence game. In The Next Floor your goal is to defend against the incoming waves of bad guys. You start off on one floor of a building, and you have an elevator in an elevator shaft. You move using either the arrow keys or the A and D keys, and you point your mouse at the bad guys and click the mouse button to fire your gun.

Killing bad guys earns you money, and it's a good thing, since the waves of bad guys get increasingly fierce and you must buy weapons that you can station in your elevators to automatically fire at the bad guys. Wait, did I just say elevators with an 's'? Yep -- as the game progresses you will find additional floors of the building open up, and you have the option to buy additional elevators to defend those floors.

One thing that was not immediately obvious to me is the fact that you can move the elevators around by dragging them with your mouse, and they can move even if there are elevators occupying every floor. If you drag an elevator to a floor that already has an elevator on it, the two elevators will magically swap positions. You can use the elevators to move your man around from floor to floor, but fairly quickly your elevators will have more firepower than your poor little dude's pistol, and you'll find you're not really using him.

The 15 levels of The Next Floor provide just the right amount of gameplay; any more would have become tediously repetitive, and any less wouldn't have given enough time to build up your elevators to the incredible killing machines they can become.

So, just how good at time waster games are you? Think you've got the stuff? Well, The World's Hardest Game 2.0 doesn't think you do.

Yes, amazingly, it's possible to have a sequel to a game called "The World's Hardest Game". It doesn't seem logically possible, since if the first one was actually the world's hardest, how could another one come along and share the moniker? It made me doubt the name in the first place. That is, until I tried the game.

The mechanics of the game are very simple. You are a small red square, and you need to move around the game board collecting yellow coins or keys, and make your way from the green starting area to the green end, without getting touched by the blue hazard balls. The only controls in the game are the arrow keys to control where your red square goes.

Like I said, it looks simple. But in practice, I gave up at level 4 after over 100 attempts. I wouldn't same I'm a video game expert, but I've certainly played my fair share of games in my time, and this one is certainly one of the most difficult.

How far can you get?

The best time wasters are games that are intellectually challenging, but not necessarily frantic or anxiety-inducing. Too many puzzle games rely on a beat-the-clock scenario to make games more challenging instead of simply making the puzzles more challenging. Well, Sleepy is a time waster that doesn't do that.

In Sleepy, the goal is to remove all of the colored blocks from the screen without waking them up. If you wake them up, a wakefulness bar starts to drop, and if it reaches the bottom, you lose at that level. The more blocks that wake up, the faster the bar moves, until they settle into new positions and fall back asleep.

The challenge in the game comes from the fact that you can only remove blocks of the colors given on one of the two indicator cards at the bottom of the screen. When one of the colors is a block that is sitting on top of a pile, it's not a problem, but soon you'll run into a situation when the only block you can remove will dislodge a bunch of other blocks, waking them up.

Sleepy is a cleverly-designed game with lots of replay value, a perfect distraction for your coffee-break or lunch time. And the soundtrack is perfect if you've got insomnia - just play Sleepy for a little while and you'll be headed back to bed.