R-Zone 2 is very similar to the original in terms of graphics and gameplay.
There are a few minor changes, some extra tile types and a lot more levels.
There is now an audible alarm when the radiation reaches danger level, so you
don't have to keep one eye on the indicator. However, the alarm is very much a
last-minute warning. You have to move as soon as you hear it.
R-Zone 2 has a pause mode, activated by pressing the spacebar. The playfield
is blanked during the pause mode, so you can't use it to plan your route!
There are three new types of tiles. Permanent (rivetted) tiles do not
disappear when you pass over them. Blank tiles are just like tiles which have
alrady been passed over, and must be avoided. One-way tiles are marked with
arrows and only let you move in the direction of the arrows.
The original game was quite limited in scope and the lack of variety made nine
levels about right. The new tile types allow for a wider variety of puzzles,
so R-Zone 2 has 32 levels.
The STOS source code for R-Zone is included in the file RMSOURCE.ZIP in the
folder pub/atari/programming/STOS at ftp.uni-kl.de (if it's not there, try
4 Davenport Road