File: BUGS

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tworld 1.3.0-5
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Contents

* Bugs in the MS game logic emulation
* Bugs in the Lynx game logic emulation
* Other bugs and misfeatures
___________________________________________________________________________

Bugs in the MS game logic emulation

* There are numerous situations in the MS game that cause a moused goal to
  be cancelled for which TW will keep trying. A clearer understanding of
  those situations is needed.
* The MS game checks for input more than once per tick. Probably this was
  done to catch last-minute keyboard events, but it has the effect that by
  having more than one input event in the queue, Chip can, under certain
  circumstances, have the latter keystroke processed after he has moved but
  before any other creatures move.
* In TW, the keyboard is scanned twice per tick, once at the beginning and
  once in the middle. As a result, if Chip makes a move at the beginning of
  a tick, the game does not update the display twice in a row (once after
  the creatures move and once after Chip moves), but just does it once. I
  do not believe that this optimization has a real effect on the gameplay.
  It does, however, make it easier to examine the screen when pushing
  against a force floor.
* There are a number of miscellaneous emulation bugs, mostly involving
  "illegal" tile combinations. These are documented more thoroughly in the
  msbugs.txt file on the website.
___________________________________________________________________________

Bugs in the Lynx game logic emulation

* Under the real Lynx game it is possible to push a block diagonally
  without moving at all. This is done by pushing against a wall, and then
  pushing diagonally against a neighboring block very briefly. The block
  will get pushed, but Chip doesn't follow. This is impossible to do in TW.
* Under the real Lynx game it is possible, with carefully constructed
  circumstances, for Chip to push a block away from him as it's heading
  towards him. That is, a block starts moving into the square that Chip
  occupies, but in the same frame, Chip starts pushing the block in the
  opposite direction. This is impossible to do in TW.
* There are a number of miscellaneous emulation bugs, mostly involving Chip
  being stuck on teleports. These are documented more thoroughly in the
  lxbugs.txt file on the website.
___________________________________________________________________________

Other bugs and misfeatures

* TW ignores field 8 entries in the .dat file unless they are exactly five
  bytes long. In this case, it simply ignores the field 6 password. The MS
  game will remember both passwords and allow either one to be used
  (although if both are present it will only show the field 8 password).