
1. Engine: Blender Game
- Info menu >> Render Engine box >> Blender Game
Note:
- There are menus that are only available when the Blender Game render engine is selected.

2. Viewport Shading: Texture
- 3D View menu >> Viewport Shading box >> Texture
Note:
- Viewport Shading Texture renders the game objects with the textures you added.

3. Material Shading: GLSL
- Properties menu >> Render button >> Shading tab >> GLSL button
Note:
- The weapon reticle also works with Material Shading: Multitexture

4. Enable GLSL settings
- Properties menu >> Render button >> Shading tab
- Enable Shaders
- Enable Shadows
- Enable Lights
- Enable Environment Lighting
- Enable Ramps
- Enable Nodes
- Enable Extra Textures
Note:
- GLSL settings appear only when the Render Engine: Blender Game is selected

5. Add a new scene
- Info menu >> Scene box >> + button >> New
Note:
- The new scene is going to be added as an Overlay Scene and will be used to display the weapon reticle