Hi, The original Tile World that was packaged only came with intro.dat, a small level set designed to introduce the game mechanics. Getting additional level sets was up to the user.
Now that the Debian package has switched to Tile World 2 (a fork of Tile World), it comes with the CCLP level packs - these are created by many different level designers from the Chip's Challenge community, and are freely distributable but not DFSG-free. I have played these level packs myself for years, but they never came with the Debian package until now - I had to download and place them in /usr/share/games/tworld myself. The authors of Tile World/Tile World 2 will be of no help here, since they are not the creators of the CCLP level packs. As for CHIPS.dat, that is the original level set from Chip's Challenge. It is not freely distributable and thus has never come with any version of Tile World or Tile World 2. Yogeshwar