A bit frustrating at times but fun once you get used to it. It's better to play this game for short periods. Frustration factor multiples quickly if you play for long durations.
The game is pretty easy until you get tired. Then, it's best to walk away and try again later. Otherwise, you end up spending 30 minutes trying to solve one puzzle and than solving it in 2 minutes the next time you log on. The game is okay. Passes the time. Without the badges, I don't think I would have been tempted to look at the game at all or go for 48.
Suggestions: 1. Difficulty setting; 2. Strategic/moral decisions similar to other adventure/rpg/stories. Example: A sidekick's husband is out there. Leave the base to search? If you do, you face enemies from 360 degrees. If you don't, sidekick leaves. Other decision. Where to place base? Abandoned farm? A warehouse downtown? Etc. Be creative. Great game though.
Tons of fun. I absolutely love it. Fairly easy, died on the 19th my first game. Survived the whole 20 the 2nd game with the Baretta. Didn't use any of the cheats mentioned above. A difficulty setting would be good. Stategy wise, move your guy so that your shots are always towards the middle or directly facing your target. That way, your bullets will most likely hit collateral targets behind. Aim just below the chin and account for your targets movement.