The Settlers 2

Level select:
Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Use a text editor to edit the "mission.dat" or "mission.cfg" file in the game directory. Replace all characters in the file with "1111111111". Any level may now be selected for game play.

Cheat mode:
Type thunder or winter (for v.1.51) during game play to enable cheat mode. An exclamation mark will confirm correct code entry. Enter one of the following codes to activate the corresponding cheat function. This will also unlock all buildings except for the harbor.

Effect	Code
View entire map	[Alt] + [F7]
Change game speed	[Alt] + [F1] to [F6]

Hint: Stop enemy building:
If an enemy starts building a large military building, such as a guardhouse or better, and will easily get rid of any buildings you are constructing by occupying the building, then quickly build a barracks at the closest possible point (so that it can be occupied before the enemy building). It may be worth destroying larger military buildings of yours so you can build the barracks. It should stop the enemy's advance. Then, destroy the barracks, and carry on as normal.
Thomas Moon.

Hint: Catapults:
Catapults do not cause the enemy to attack you. Use this to your advantage by destroying as much of enemy land as possible without actually attacking, by building catapults. Note: Catapults use up stone supplies quickly.
Thomas Moon.