Level 80: VANISHING ACT (EVUG)

Popup: Chip used to spend his time programming computer games and making models. But that was just practice for this brain-buster!
Richard Field: This is a difficult maze. It is possible to do it without making a map, but not easy. If you need help, the following instructions can be used right from the start or picked up part way through. Go:
4RURRURRD [CHIP 1]
U5RUUL [CHIP2]
R10U2L7D5L2U3R5U2LD [CHIP 3]
URRDDD4L3U3L2D3LDL [CHIP 4]
RDDLLDD3L2D2R [CHIP 5]
LLUU3R2U4L5U4L2D2R2D4L4U3L2DR [CHIP 6]
LDDRDDL3D3RD [CHIP 7]
U5R2U [CHIP 8]
DD3L2DRD [CHIP 9]
RDRDDRRURURURRDDDDLLDDLLULLLLUUULULULLLLDDRRRDRDDLLLUL [CHIP 10]
RDDDRDRRU [CHIP 11]
DLLULLDDDDDDRRDD [CHIP 12]
RRRRRRURRU [CHIP 13]
DDRRUUURRUURRDDRRU [CHIP 14]
DLLUULLDDLLDDDLLULLDDDRRRRRRUUURRDDDRR [CHIP 15]
RRU [CHIP 16]
DRRRRURRUULLLLUUUUURRDDDRRRRUUUR [CHIP 17]
LDDDLLLLUUULLDDDDDRRRRDDDRRRUUUL and exit.

Actually I didn't find it all that difficult. Armed with just the general knowledge that I could only walk along the dirt paths, without drawing or using a map, I finished the level in 669 (131 seconds) at first try.