The level is made of 16 rooms in a 4x4 grid. There are 4 different basic room types:

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The first altar you blow up will have spiders.The second altar will have more spiders and a ball and chain.The third altar will have another ball and chain a.

I've recently been playing Spelunky HTML5, on a chromebook downloaded from the chrome web store. A general population of people seem to be able to replicate the bug doing the same thing, the bug itself is to do with only being able to jump half a block high.
I found that if you go to some gold and keep pressing the left and right arrows, the gold will repeat so you have that same gold multiple times. Ha, well, GameMaker’s compiler did 99% of the work. If you're able to find the You can kill him with two sticky bombs, careful use of the shotgun, or luring him onto a Tiki trap. Successfully complete the indicated task to unlock the corresponding.

0: a side room that is not on the solution path
1: a room that is guaranteed to have a left exit and a right exit
2: a room that is guaranteed to have exits on the left, right, and bottom. If there's another '2' room above it, then it also is guaranteed a top exit
3: a room that is guaranteed to have exists on the left, right, and top

The first thing it does is place a start room in the top row. Room type doesn't really affect the start rooms, as it's a special case, but generally speaking a start room is type 1 or 2.

Every time a room is placed, at first it is always a type 1 room (left/right).

Then it decides where to go next. It picks a (uniform distribution) random number from 1 to 5. On a 1 or 2, the solution path moves left. On a 3 or 4, the solution path moves right. On a 5, the path goes down. (If the solution path hits the edge of the screen, then it immediately drops down and switches its left/right direction.)

Now here's the thing: if we move left or right, that's all fine and dandy because we've placed down a room with guaranteed left/right exits. But if we've decided to move down, we need to change the room we're in! So the generator overrides the current room to be type 2 (which always has a bottom drop) and we're all good to move down now.

Once it's moved onto the next room, it asks whether the last room we placed was type 2 (bottom drop). If this is true, then this room HAS to be another type 2 bottom drop, or a type 3 upside-down T shape. Since types 2 and 3 have left/right exits, we can start the algorithm all over again.

If we are on the bottom row of room, and we try to drop, instead of dropping down, we place the exit room.

Now we have the entire solution path generated (what's in red above). The last thing we do is we add some random type 0 rooms to every grid space that is not on the solution path. These rooms don't have any guarantees of exits on ANY side, which is why you sometimes see them walled off.

If there are 3 or 4 type 0 rooms making a vertical line, then there is a chance that those rooms will become a snake pit. If we decide to make a snake pit, we put down, from top to bottom, a sequence of room type 7 8 9, or 7 8 8 9, depending on the depth of the snake pit we want. (You'll notice that snakes and jewels get placed manually at this point, since they're really part of the landscape and aren't randomly placed like most other enemies.)

That's it! In part 2 I show you how individual rooms get laid out (spikes, ladder/pit formations, etc).