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VBS Boulderdash

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VBS Boulderdash
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Features
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Responsive character movement using the cursor keys, and always
the same speed regardless of the user's keyboard delay.

Includes the three main Boulderdash games from the C64 (60 caves)

Exact rules of Boulderdash, also the timings are near-perfect
(I tested it a lot using the real C64 Boulderdash). Scrolling
isn't as smooth though.

The "engine" can handle a full cave of moving Fireflys or any
other moving object without any speed loss.

Different colours for each cave using a very sneaky GIF trick
(no palette modification or duplicate images where used)

Sound effects workaround using midi (Wavs are too laggy and midi
is a bit poor, but it's better than nothing)

Changeable display size and game speed...saved in a cookie.

Cave editor with quick test functionality (and a few extra
game objects)

Fully commented and un-encoded source. Feel free to use any
techniques I discovered (but give me a credit...please?)

Made entirely in VBScript and HTML so really it should be
called DHTML-Boulderdash, but there's already a game called that.
(Hell, it's 90% VBScript anyway so it should be called VBS-BD)

The Game
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You are Rockford (the ant?) and your goal in life is to collect
as many diamonds as you can.  Rockford travels through different
caves dodging boulders and digging dirt until he's collected
enough diamonds, then escapes through the exit to the next cave.

Game Keys
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Press the cursor keys to move Rockford around the cave.

Press right control (RCTRL) and a cursor direction to dig dirt or
collect diamonds without moving (this is called snapping). Use
snapping to set free trapped Fireflys or Butterflys without letting
Rockford get near them.  Take care snapping items from above as
anything above the area you snapped will come crashing down on you
(boulders or diamonds)

Speed And System Keys
---------------------

NOTE: All the hot keys mentioned below have a menu option as well

It's highly unlikely that VBS-BD will run too slow for you (as it
was made with a decrepit Pentium II), but it may be too fast.

The FPS (frames per second) is located at the bottom right of the
screen. If the FPS is below 6 or above 8 then it will be red
otherwise it will be green. What you need to do is get the game to
run at a nice green 6-8 FPS (the same speed as the original
Boulderdash).  There are two ways you can do this:

1. Make the screen bigger using [HOME] and [PAGE UP]
2. Add a delay to the game using [+]

If you have a good PC then you may need to do BOTH of these (lucky
you!). When you have it just right press [INSERT] to save these
settings in a cookie.

If you have a PC like mine and you desperately want to play it with
a large screen you can switch off the throttle by pressing [T].
A warning though, without the throttle the game will speed up and
slow down when it wants to which makes it harder to play.

Then again, sometimes slower is better. If you find the game too
hard then playing it at a slower speed helps a bit. Likewise, if
you have the speed just right and want to speed it up temporarily
(if you're waiting for Amoeba to grow), you can disable the
throttle.

Press [S] to switch between tight (easy) and loose style scrolling.
Tight will keep Rockford in the middle and scroll around him,
loose will scroll when you reach the edge of the screen and then
catch up with you.  Loose scrolling is the same as the original
Boulderdash but is for the "hardcore" only as it's very
disorientating (old Spectrum 48k users should be fine though as
it's scrolls the same as their version of Boulderdash)

Press [P] to pause the game. It also stops redrawing and gives you
back 100% CPU time (kernel processor usage) so you can do other
stuff. You should pause before using the editor if you have an old
PC.

Press escape [ESC] to commit suicide. (incase you get stuck)

Select a game by pressing [1],[2],[3] or [4]. You may also start
at certain points in each game by pressing [A],[E],[I] or [M]
(as soon as you press any of these keys a new game begins with
3 lives and zero score)

To play a cave in the clipboard press [SPACE]. (see the cave
editor's help to learn more about custom caves)

Game Elements
-------------

Diamonds	Collect as many as you can to escape the cave.
		Will fall if there's a space below killing most
		things...including Rockford.

Boulders	The main obstacle of the game. Like Diamonds they
		will fall and kill you. Can be pushed left or right.
		The diamond and the boulder both roll off each
		other.

Dirt		Stops all moving objects except Rockford and the
		Amoeba. Rockford can dig it!

FireFlys	Weird square things that move around clockwise.
		Deadly to touch but can be crushed by boulders.

Butterflys	Like the FireFly but anti-clockwise. Explodes into
		nine diamonds.

Steel Wall	Indestructable wall.

Normal Wall	Can explode. All gravity objects will roll off the
		normal wall, so beware.

Exit		Looks like a steel wall until you collect enough
		diamonds then starts flashing. Enter it to leave
		the cave.

Magic Wall	Looks like a normal wall until you drop a boulder or
		a diamond onto it, it will then start flashing.
		While it's in this state all boulders turn into
		diamonds and diamonds turn into boulders. (It also
		swaps bombs and nuts in the same way)

Amoeba		Green blobby thing. Grows in size, kills FireFlys
		and Butterflys. If it grows too big it will turn
		into lots of boulders. If it gets trapped it will
		turn into lots of diamonds. Doesn't hurt Rockford
		but it can trap him.

Slime		(BD2) Looks like the Amoeba but doesn't grow. Will
		let boulders and diamonds pass through it if there's
		a space below it, and after a random delay.

Trap Wall	(BD2) Looks like a normal wall, but will grow left
		or right if it has space, which is bad.

Rockford	(BDCK) Looks like you and just sits there. If he
		dies you die (but can't be crushed by boulders)

Extra Elements
--------------

New Trap Wall	Two types: vertical and all ways. The "all way" is
		pretty nasty as it can flood a cave in seconds.

Nut		Moves like a boulder except it doesn't kill you. If
		it gets hit from above by a boulder it will turn
		into a diamond.

Bomb		Explodes on impact....watch out.

Conveyor Belt	Moves most objects left or right (including walls!)

Robot		Moves towards Rockford but only kills him if it
		moves onto him (and not touching). Crushed by a
		boulder but not a diamond.

Hot Steel	Destroys everything around it (except steel walls)
		and is indestructable.

Generator	If touched by a moving object, that object will be
		absorbed and the generator will start to mass
		produce it. Has obvious benefits and pitfalls.

Teleporter	If entered from above or left then Rockford will be
		transported to the next teleporter. Below and right
		will teleport him to the previous one. He won't
		travel if the way is blocked...even by dirt.

Credits
-------

Peter Liepa and Chris Gray for creating the amazing game
Boulderdash, which ate a lot of my free time when I was younger <img src="//theme.webme.com/smiles/rolleyes.gif" border="0" width="15" height="15" alt="" />

FirstStar Software, for licensing Boulderdash and not taking down
this tribute game.

Holger Schemel for hosting the game, and also the author of the
brilliant BD clone "Rocks'n'Diamonds", which eats a lot of my free 
time today <img src="//theme.webme.com/smiles/rolleyes.gif" border="0" width="15" height="15" alt="" />

Peter Broadribb and his BDCFF web page which describes each element
in exact detail, without which I'd never of got the Firefly's
movement right.

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