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'''Tile''' refers, broadly, to any distinct element within the world of [[Chip's Challenge]].  For example, [[Chip]] himself, the iconic [[computer chip]]s, locked [[door]]s, and pushable [[block]]s are all tiles.
A '''tile''' is a generic square with which [[Chip]], [[monster]]s and [[block]]s can interact in [[Chip's Challenge]]. Tiles have varying functions. The most basic tile is the [[floor]], which any moving object can pass through. Chip himself is a tile that can be controlled by the user, blocks can be moved by Chip to accomplish specific objectives, and [[monster]]s are tiles that move and behave differently according to their type.


Other uses of the term include:
Each tile has a number assigned to it, indicating its index in a tile set. For example, the tile [[Floor]] has index 0, [[Wall]] has index 1, and the [[Hint]] has index 47.


* Elements like the [[toggle door]], which are really a collection of multiple tiles (the "open" and "closed" states are internally distinct in every Chip's Challenge game), but which act like a single entity that changes state.
There are four [[Not used|unused tiles]], which have indices 32 (above the [[thief]] in the tile set), 54, 55, and 56 (all adjacent, after the [[Burned Chip]]). Of these, tile 32 (commonly called [[Combination|Combination tile]]) is used internally by [[Chip's Challenge]] as an overlay buffer, which is drawn when a transparent tile is above another tile.
* An element ''and'' its facing direction, especially when editing for the [[DAT]] format, which encodes such combinations as single bytes.  For example, a west-facing [[glider]] is an available DAT tile, corresponding to the byte <code>0x51</code>.
* A combination of tiles that functions as a single unit, especially if it alters the behavior of its parts.  For example, a "fireball cloner" is really a [[fireball]] on top of a [[clone machine]] (which prevents the fireball from moving), and a "no green keys" sign is really a [[green key]] beneath a [[no sign]] (which prevents the key from being picked up).
* One of the square positions within the grid of a level, which may contain multiple elements.  For example, "[[invalid tile]]" can refer to a ''stack'' of tiles expressible in a [[DAT]] level but that would be impossible on the original [[Lynx]] game.  More pedantically known as a '''cell'''.
* One individual square of artwork used by any version of the game, known more generally in game development as a '''sprite'''.


== Types of tile ==
== The CC tile set ==


Tiles can be informally grouped into several categories, based on their behavior.
[[File:Color Tileset.gif]]
 
[[Category:Tile groups]]
* [[Terrain]] — static tiles that cannot move
** [[Acting floor]] — the [[floor]] tile specifically, and others that allow free passage
** [[Acting wall]] — the [[wall]] tile specifically, and others that can't be moved into
** Locked [[door]]s
** Buttons
* [[Item]]s — tiles that can be picked up; may or may not be considered terrain, depending on ruleset
** [[Key]]s
** [[Boot]]s
** [[Computer chip]]s
* [[Actor]]s — tiles that can move
** Players — [[Chip]] and [[Melinda]], the only tiles controlled by the human player
** [[Monster]]s
** [[Block]]s
 
== Layers ==
 
Tiles can also be grouped based on whether two different tiles can coexist in the same cell.  If two tiles ''cannot'', they are said to exist on the same '''layer'''.  The set of layers is defined by a combination of ruleset and file format.
 
=== [[Lynx]] ===
 
The original game was designed around having two layers:
 
* Static tiles — including both terrain and items
* [[Actor]]s — everything that can move
 
The game's internal data structure defined a level as a single 32×32 layer of static tiles, plus one optional actor per cell.  It was thus impossible to create otherwise intuitive combinations like a key on top of [[gravel]], because both the key and the gravel would have had to occupy the same space.
 
=== [[MS]] ===
 
Strictly speaking, [[MSCC]] was only designed to play the [[Chip's Challenge|original levels]], so it was likely ''intended'' to obey the same layering restrictions as Lynx.  However, it takes an unusual approach to layering: each cell is a [https://en.wikipedia.org/wiki/Stack_(abstract_data_type) stack] of any two tiles.  Internally, a gravel tile looks like this:
 
{| class="wikitable" border="1"
|[[Image:Gravel.png]] Gravel
|-
|[[Image:Floor.png]] Floor (nothing)
|}
 
If [[Chip]] then steps into this cell, the gravel ''moves down'', and he takes its place:
 
{| class="wikitable" border="1"
|[[Image:Chip S.png]] Chip
|-
|[[Image:Gravel.png]] Gravel
|}
 
When he leaves, the gravel will move back up and a floor tile will fill the empty space, returning things to the first diagram.
 
The [[DAT]] format invented for MSCC inadvertently exposes this arrangement to level designers, allowing a level to have ''any'' two tiles stacked atop one another.  The game wasn't designed to handle two actors or two static tiles in the same cell, so various unusual effects may occur.  Combinations of tiles that are technically possible to create in a [[DAT]] level, but could not have been represented in the original Atari Lynx game, are called [[invalid tile]]s.
 
=== [[Steam]] ===
 
Steam rules are designed for the much more expansive set of tiles available in [[Chip's Challenge 2]] and introduced much greater flexibility in layering.  From bottom to top, the layers are:
 
* Terrain
* Item — includes both kinds of [[bomb]] and all three [[time modifier]]s
* Item mod — only the [[no sign]]
* Actor
* [[Thin wall]] and [[Canopy]]
 
Entering or exiting a cell results the tiles to be updated in this order.
 
The order entry collision is checked, on the other hand, is different, and is:
 
* Thin wall and Canopy
* Item mod
* Terrain
* Actor
* Item (If there is an actor on the cell, even if it doesn't block the entrant, the collision check with this layer is skipped)
 
Each cell must have a terrain tile — in fact, CC2's [[C2M]] level format enforces it — but every other layer is optional.
 
For Chip's Challenge 1 tiles, the most notable improvements are the ability to place an item on top of any kind of terrain and the ability to place thin walls, in any combination, atop anything else at all.  The other new layer is dedicated to new CC2 tile: the no sign. Canopies are the same tile internally as thin walls, so, as a consequence, they can be placed on any cell, optionally in combination with thin walls.
 
Weirdly, the C2M format allows for multiple tiles of the same layer to be placed on the same cell, which results in all but the last tile of that layer to be [[Despawning and Respawning Glitch|despawned]].
 
== [[Chip's Challenge 1]] tiles ==
 
{| class="wikitable" border="1" style="width: 50em; table-layout: fixed;"
|[[Image:Chip S.png]] [[Chip]]
|[[Image:Computer chip.png]] [[Computer chip]]
|[[Image:Socket.png]] [[Chip socket]]
|[[Image:Exit.png]] [[Exit]]
|-
|[[Image:Floor.png]] [[Floor]]
|[[Image:Hint.png]] [[Hint]]
|[[Image:Thin wall SE.png]] [[Thin wall]]
|[[Image:Wall.png]] [[Wall]]
|-
|[[Image:Invisible wall.png]] [[Invisible wall]]
|[[Image:Hidden wall.png]] [[Hidden wall]]
|[[Image:Recessed wall.png]] [[Recessed wall]]
|[[Image:Blue wall.png]] [[Blue wall]]
|-
|[[Image:Water.png]] [[Water]]
|[[Image:Fire.png]] [[Fire]]
|[[Image:Ice.png]] [[Ice]]
|[[Image:Force floor S.png]] [[Force floor]]
|-
|[[Image:Dirt.png]] [[Dirt]]
|[[Image:Gravel.png]] [[Gravel]]
|[[Image:Ice NW.png]] [[Ice corner]]
|[[Image:Force floor Random.png]] [[Random force floor]]
|-
|[[Image:Flippers.png]] [[Flippers]]
|[[Image:Fire boots.png]] [[Fire boots]]
|[[Image:Ice skates.png]] [[Ice skates]]
|[[Image:Suction boots.png]] [[Suction boots]]
|-
|[[Image:Blue key.png]] [[Blue key]]
|[[Image:Red key.png]] [[Red key]]
|[[Image:Green key.png]] [[Green key]]
|[[Image:Yellow key.png]] [[Yellow key]]
|-
|[[Image:Blue lock.png]] [[Blue lock]]
|[[Image:Red lock.png]] [[Red lock]]
|[[Image:Green lock.png]] [[Green lock]]
|[[Image:Yellow lock.png]] [[Yellow lock]]
|-
|[[Image:Block.png]] [[Block]]
|[[Image:Teleport.png]] [[Teleporter]]
|[[Image:Thief.png]] [[Thief]]
|[[Image:Bomb.png]] [[Bomb]]
|-
|[[Image:Green button.png]] [[Green button]]
|[[Image:Red button.png]] [[Red button]]
|[[Image:Blue button.png]] [[Blue button]]
|[[Image:Brown button.png]] [[Brown button]]
|-
|[[Image:Toggle wall Closed.png]] [[Toggle wall]]
|[[Image:Clone machine.png]] [[Cloner]]
|[[Image:Tank S.png]] [[Tank]]
|[[Image:Trap.png]] [[Trap]]
|-
|[[Image:Fireball.png]] [[Fireball]]
|[[Image:Glider S.png]] [[Glider]]
|[[Image:Bug S.png]] [[Bug]]
|[[Image:Paramecium NS.png]] [[Paramecium]]
|-
|[[Image:Pink ball.png]] [[Ball]]
|[[Image:Walker NS.png]] [[Walker]]
|[[Image:Teeth S.png]] [[Teeth]]
|[[Image:Blob.png]] [[Blob]]
|}
 
[[MS]] also has the [[clone block]], used to indicate the direction of a block cloner.  This is a tile in the sense that it can be placed within a level, but it exists as an editing trick and is not intended as a distinct game element.  In all other [[ruleset]]s, dirt blocks have a direction like every other moving object, so a separate clone block is unnecessary.
 
=== Invalid tiles ===
 
These tiles are possible to place in a level due to being a part of the [[DAT]] format, and only exist as placeable tiles due to quirks of the implementation. Most of these tiles with graphics behave the same way a [[wall]] does, with Swimming Chip behaving closer to an extra player in a level.
 
* [[Image:Chip in Exit.png]][[Image:Exit2.png]][[Image:Exit3.png]] [[Fake exit]] (appears in [[Planet of the Teeth]])
* [[Image:Swimming Chip S.png]] [[Swimming Chip]] (appears in [[The Block Stops Here]])
* [[Image:Drowned Chip.png]] [[Drowned Chip]] (appears in [[Mads' Rush II]] and [[Loop]])
* [[Image:Burned Chip.png]][[Image:Chip_in_Fire.png]] [[Burned Chip]] (appears in [[Escape from Chipkatraz]])
* The [[Combination]] tile
* Three [[Not used|unused]] tiles
* Additional undefined tiles with strange behaviors (an example can be seen [http://davidstolp.com/old/chips/level.php?set=TCCLPRejects&level=82 in TCCLPRejects here])
 
One of the unused tiles found new life in the "pgchip" patch for [[MSCC]], which replaced it with the [[ice block]] from CC2.
 
== See also ==
 
* [[:File:Color Tileset.gif|The MSCC tileset]] (in the sense of spritesheet)
 
* [[Category:Tiles]]
* [[Category:Tile groups]]
* [[Category:Terminology]]
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