Addictive, minimalistic, frustrating, brain-melting fun. If I could have just four adjectives and a noun to describe Hello Worlds!, I would pick those exact words. Get ready to meet one of the most engaging Flash platform games you can play in your browser, for free, right now.
Other platformers, such as Elephant Quest, involve vast, sprawling levels where you are beset by enemies on every side and must shoot your way to freedom while frantically running and jumping all over the place. By contrast, Hello Worlds! has no shooting whatsoever. The levels aren't exactly sprawling, either, with each taking up just one screen (700 by 550 pixels). In that regard, it is similar to another platformer, Achievement Unlocked 2, but that's where the similarity ends. Created by the University of Washington's Computer Science department, Hello Worlds is a very cerebral platformer.
Each Hello Worlds! level is split into two, three or four parallel worlds. A wall in one world will block your way in all worlds; a platform in one world will hold you aloft in the other ones. The whole game is built on the interaction between these worlds: Stand on a ledge in one world, and jump onto a higher ledge in another world.
Each world has a door; when you get to it and hit Space, that world disappears. Sometimes it goes away entirely, leaving you with a simpler level, and sometimes it is replaced with another world which you must now navigate. Every Hello Worlds! level also has a "level door," which you must reach to complete the whole level. Oh, and don't forget to collect the stars you see along the way: They help the score, and allow you to get to the more advanced levels.
Making it through a level depends on navigating all worlds correctly. If you trigger the door on one of the worlds too soon and make it disappear when you actually still needed it, you will not be able to complete the level. Fortunately, you can press and hold V on your keyboard to undo your actions. This isn't a quick undo to a save point, but actually a rewind much like the one in a VCR (or VLC, if you're more modern). You see your character quickly retracing its steps, and can release the V key at any time you want to stop, even midair. See all: PC Advisor software downloads
Hello Worlds!'s rewind feature doesn't just retrace running and jumping, but all actions. So if you just realized you shouldn't have made that last world disappear, no problem - just rewind.
When a level is split into four, it can get tricky to visualize. Sometimes you see where you're trying to go, but you're not quite sure what you should be standing on to get there. When that happens, you can hit C to converge all parts of the level, so you're looking at the whole picture for once. But you can only look: While holding C, you are not allowed to move. See also: Group test: what's the best game for PC?