

Series : Warhammer 40,000 Developer : Flashback Games Publisher : Slitherine Genre : Turn-based strategy Graphics : Hex Grid Achievements : truesteamachievements.com

The first 16 or so scenarios you're only playing with the Imperial Guard. After this, the Space Marines will show up.
You can buy new units with Requisition Points (gear symbol) using the Purchase button, but only up to the number listed at the top left of the Purchase screen. If a unit is destroyed, this number will increase, allowing you to purchase a unit as a replacement.
This game has a built-in manual, accessible from the Main Menu.
The icon underneath each unit shows a green arrow if the unit can move, a bullet if the unit can fire, and the Strength (0 means the unit is destroyed).
Infantry can heal in building tiles.
Hotkeys
[] - Select unit I - Mission objectives R - Rest (recover HP and morale) U - Upgrade unit P - Purchase unit Backspace - Undo move Alt+E - End turn/deployment Space - Toggle UI Ctrl+L - Load Ctrl+S - Save Right-click on unit: Detailed stats
The tutorial has 5 missions, Act 1 (Imperial Guard only) has 12 scenarios, Act 2 (Space Marines) has 6 scenarios, Act 3 has 6 scenarios. I had to consult the game data file 2ndwar.whdat for this information.
Upgrading units is unrelated to experience, it just costs Requisition.