If you are having trouble moving around, check your settings in the menu. The default movement typically uses: W / S / A / D: Forward, Backward, Strafe Left, Strafe Right. Crouch (Toggle). Walk/Run modifier.
David Jones (the protagonist) is a highly trained SAS operative, but apparently, he skipped leg day. The engine (a modified version of the Flight Unlimited engine) was not designed for platforming or vertical exploration in the way Half-Life or Quake was. Instead, the developers implemented a specific, contextual system. how to jump in igi 1
Check the in-game options menu under "Controls" to ensure the Jump action is assigned to the Spacebar. If you are having trouble moving around, check
To cover more distance and run faster, players use a combination of directional keys and jumping. Pressing Forward + a side key (Left or Right) + Jump simultaneously allows you to cover significantly more ground than a standard forward jump. Walk/Run modifier
The engine modifies your player's collision model and momentum when zooming with the binoculars. If you cancel the zoom at the right microsecond while sprinting, the game fails to correct your Z-axis (vertical) velocity, giving you a small "pop" upward. This can allow you to jump over small fences, enemy sandbags, and even certain crates that are otherwise impassable.
If you are stuck in the terrain, some players use the "Nada" cheat to enable a fly mode, though this is generally used for debugging or getting out of glitches rather than standard gameplay. Common Movement Controls