To find the cache you will need to complete the Reverse Wherigo Cartridge. Never done one of those before? No problem - I will guide you through it, it really is very simple. First things first, you do NOT have to do the cache walking backwards. You could try, but nobody except YOU is responsible if you fall over.
First set of 6 number are obtained from the North facing wall (the front door).
Number of letters in the word on the front door. = A
Look at the building alarm, it has a phone number on it, what is the 4th number. = B
Look at the building alarm, it has a phone number on it, what is the last number. = C
Look at the building alarm, how many letters on the large font. = D
Look at the building alarm, it has a phone number on it, what is the 2nd number. = E
Look at the building alarm, how many number are in the middle set. = F
Second set of 6 number are obtained from the East facing wall.
Look at any of the windows, there is 2 halves, subrtract the top set from the bottom set. = G
Look at all the windows along this wall, how many are there. = H
Look at the phone number below the Giraffe, what is the 3rd number. = I
Look at the phone number below the Giraffe, how many 1s are there. = J
Look above the Giraffe, how many letters are in the 2nd word (name of the nursery). = K
Look at the top half of the window, how many panes of glass are there. = L
Third set of 6 number are obtained from the South facing wall (concentrate on the one with the chimney only).
Facing the South facing wall, there is 3 windows, subtract the top panes of glass from the bottom panes of glass. = M
Look at the street sign, subtract the smallest number from the highest number, then subtract the number of letter from that. = N
Look at the street sign, subtract the smallest number from the highest number. = O
Look at the street sign, add the number of letters together for the name of the street. = P
Facing the South wall, look up towards the roof, how many air vents are there. = Q
Facing the South wall, how many windows are there. = R
ABCDEF
GHIJKL
MNOPQR