Just type anywhere in the game

 leben          Full life
 hype           Full life
 druidik        Full magic power
 druide         Full magic power
 protek         Restore shield
 gork           Restore shield
 frik           Give 1 to 99 plastyks
 littletroll    Restore life points when idle
 littlegogoud   Restore magic points when idle
 youngelf       +10 blue arrows
 ouioui         +10 blue arrows
 oldelf         +10 red arrows
 nonnon         +10 red arrows
 grolot         +1 of everything in inventory
 toutundefi     Destroy shield
 tunnel         Change camera
 pouletfrit     Add speed boots to inventory
 wonderful      Run very fast
 glittergold    Free money
 thundergod     God mode
 hermetik       Infinite magic
 thereyougo     Infinite magic
 houdini        Infinite arrows
 end02          One hit to defeat Barnak
 epok1          Epok 1 finished
 epok2          Epok 2 finished
 epok3          Epok 3 finished