Type following codes in 3-D mode:

hugeguns    Lots of ammunition
vulture     You can fly
xray        See animal kill zones
hgwells     Become invisible
flaggall    Mark licensed animals on map
flagevery   Mark all animals on map
gps         Show position in world coordinates
license1    Buy a hunting license for eland
license2    Buy a hunting license for zebra
license3    Buy a hunting license for elephant 
license4    Buy a hunting license for kudu

Note: If you use any of these codes, you will forfeit any score for that hunt.

Thanks to Revolution readers Dirk Chisnell and Nick Backes!