Pretty fun! I think I have one right. The others are harder. Thanks for sharing!
LETS TEST YOUR MATING SKILLS!! MATE IN 4 PUZZLES

Where did you get your second puzzle from?
I just can't believe it: the Rybka4 book has the solution as book moves, including different responses by black. 1. Qd6+ Ka8 2. Qc6 are 'book' moves...

First one took me forever, ugh. Nice puzzles though. The 2nd moves for all of them are fun.
1.Qf4+ Ka5 2.Qxf5+ exf 3.Nf5+ Kg5 4.Rg6#
1.Qd6+ Kh1 2.Qc6 Bxc6 (2...Qc8 3.Rd8 Rg8 4.Qxb7#) 3.Rd8+ Bc8 4.Rxc8#
1.Nxc7+ Bxc7 (1...Kb8 2.Nca6+ Ka8 3.Qxb7+ Kxb7 4.Be4#) 2.Qxb7+ Kxb7 3.Be4+ Kb8 4.Na6#

Where did you get your second puzzle from?
I just can't believe it: the Rybka4 book has the solution as book moves, including different responses by black. 1. Qd6+ Ka8 2. Qc6 are 'book' moves...
I never tried it in Rybka 4 book. hmm found it from an article from 1827 by W.lewis i never thought i could found interesting puzzles in old stuff. Fun puzzles indeed.

First one took me forever, ugh. Nice puzzles though. The 2nd moves for all of them are fun.
1.Qf4+ Ka5 2.Qxf5+ exf 3.Nf5+ Kg5 4.Rg6#
1.Qd6+ Kh1 2.Qc6 Bxc6 (2...Qc8 3.Rd8 Rg8 4.Qxb7#) 3.Rd8+ Bc8 4.Rxc8#
1.Nxc7+ Bxc7 (1...Kb8 2.Nca6+ Ka8 3.Qxb7+ Kxb7 4.Be4#) 2.Qxb7+ Kxb7 3.Be4+ Kb8 4.Na6#
Yah,the first one is tricky, but atleast you got them all correct. Congrats! :)
MATE IN 4 PUZZLES
I have these beautiful chess puzzle that i found recently. I want to share it to you guys. Il be not posting the solution yet. (maybe in a different post) but if you want the solutions you can message me.. Comment your solution Guys! Give it a shot!
Enjoy!