Level 29:
1) LDLU to get the L-Sensor-B. Then L, blow the bomb, then U to
the corner blowing the bombs along the way.
2) R through the L-auto-gate. Then URDRDRU before the next bomb
blows to get the R-Sensor-B. (Doesn't close the R-auto-gate.)
3) DLDRURL to get R-Sensor-L and L-Sensor-R.
4) ULURDULD to get L-sensor-L
5) D through the reflecting block, RU through the bombs, R trip
the other AG, RDRURUL across the gap again and back to the closed
R-AG. DURD to finish the R-Sensor.
6) D again through the reflecting block. RD through the bomb. LUL
through a pair of AG's. L(Blow the bomb)URULDDRURU to exit.
Level 30: We label sensors 1-2-3 left to right.
1) RDRU to get 3-S-L and 3-S-B.
2) RU[BlowBomb(BB)]U[BB]UL[BB]. It is critical that the second
bomb from the bottom in the right "O" is left untouched.
3) LD[BB]D to get 3-S-Top, L for 2-S-R, then
U[BB]UL[BB]L[BB]L[BB]LD to get 1-S-T
4) Time important: UL[BB]L on the first O then quickly DR for
1-S-L and UL before the middle bottom bomb of the first O blows
up.
5) Time important U[BB]UR. You must hurry to get back before the
bomb touched with the R move blows up. Quickly DLURU for
(1-S-B)(2-S-L).
6) LUR[BB]R[BB]R[BB], but don't move right through the space next.
7) Time critical, you have very little time to do the next step,
you must make it back to the next touched bomb before it blows up.
This is it: RDRU for 2-S-B --> RU[BB]U[BB]UL[BB]L[BB]L
8) Now that you're stoped there just remains DL for 2-S-T and
1-S-R, UR, D[BB]DL for 3-S-R, U[BB]UR[BB]R to exit.
Special thanks to Arseniy for posting this game.