I just uploaded and linked-in the map (100 tilez wide by 100 tilez tall! ... that is 3200X3200 pixelz) for this CL. Unlike the other actual size mapz I have uploaded, this one containz hundredz of visual errorz ... partial (and/or overlapping) Rolling 8 Ballz and sometimez more of them than exist(!) between the Arrowz guiding them.
SpotLightz are similarly partial/overlapping and mis-synchronized.
There are multiple Toggling Bridge tilez, frequently 'caught' with part in 'fatal' state and part in 'safe' state ... I am simply unwilling to take the time to try to catch them properly synchronized. But there are also dozenz of Toggling Bridge tilez which show a 'safe' tile under a 'fatal' one. These are designed into the CL ... multiple logicz in the same space. Designed that way deliberately to disturb the solver's ability to determine the true path through the Bridge. Definitely "not nice"!
To put together the map, I did 30 screen capturez in 800X600 screen resolution ... 5 horizontally and 6 vertically for each horizontal 'column'. I simply could not bring the entire 'set' of Rolling 8 Ballz or Toggling Bridge tilez into one screen in order to capture the proper number of objectz ... in synchronization.
So this Custom Level qualifiez as "Frustrating" in more wayz than one!