Somehow this should be much more enojyable, but it really is hard. In the options i should see that it should grey out hints that are correct but that is not happening for me. Other is that error checking should be better, if all are filled and it should say that somewhere if you have filled column/row wrong. Really frustrating game, i have to say.
Walkthrough:
1. Badge: Equip sunglasses and dont take off them. You will not get badge if you do.
2. In every level there is one ace of spades. You need to shoot it. Dont worry if its cant find it since if you dont finish the level you can try again. You dont need to shoot it again you shot it previously, so you can focus only finding it.
After you have collect all of them then in trophy room click on the stack of cards are after finishing shooting click continue in the bottom right.
The level 16 still is the hardest, even though I have played before it already. Finished it 24-25 minutes so it can be done fast if you have played a lot of puzzle games like this.
Finished all the levels. To me 90s level were the hardest, but still quite normal difficulty. I had most problems when with earlier levels 0-20s but later was easier but in the middle difficulty was quite low so finishing levels turned into tedious work.
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