Bonus level:Go directly opposite all the characters and use the wooden door in the final scene. You will be able to enter after all the action is over. In the bonus mission your objective will be to protect the development team. You can view hidden text during the bonus levels by looking at the subtitles.Achievements:ACHIEVEMENT – HOW TO UNLOCKBeat Civil War (25 points) – Beat all levels in the Civil War campaign.Beat WW1 (25 points) – Beat all levels in the WW1 campaign.Beat WW2 (25 points) – Beat all levels in the WW2 campaign.Secret Mission (75 points) – Beat the secret mission at the end of the game.Beat Darkest of Days (100 points) – Beat all levels in the game on normal difficulty or higher.With Chest Hair (200 points) – Beat all the levels in the game on the highest difficulty.Pistol Upgrade (100 points) – Fully upgrade all pistol settings.Rifle Upgrade (100 points) – Fully upgrade all rifle settings.Horse Puncher (100 points) – Punch a horse in the face and kill it.Ghandi Award (100 points) – Beat a combat level without using any lethal attacks.Rage Fists (100 points) – Kill at least 25 NPCs with your bare hands.Bomb Technician (25 points) – Kill yourself with an explosive device.Tethered Swimming (25 points) – Dround underwater.