Conc_Speed2
Conc_speed2 has a total of 3 secrets. One secret reveals the next secret and the next secret reveals the last secret. The amazing thing about it all is the last secret, put bluntly, sucks. Even though it sucks we decided to do it and here are the screenshots to show you where everything is.
This first picture shows you all 3 secrets places:

The first secret is in between jumps 9 and 10. There is a small crack in the middle of the top part that you can shoot to make a hole.




The next secret is inbetween jumps 21 and 22. (It is another crack at the end of jump 21, shoot it to open it).




Here is the last secret just above jump 26... I'll let you decide for yourself whether or not it is truely worth it.



That concludes the boring secrets of conc_speed2.