This is another one of my little experiments, because you know... why not! If you'd like to take part then go and grab yourself a pair of 3D glasses, I'm not talking about those new shaded ones though, I mean the standard Red and Blue/Cyan ones. This experiment is to test the old 3D double image effect on Sonic 1. It uses various effects which include; different colour shades, different image displacement types, and different drawing modes. It isn't perfect as, clearly speaking, the levels are not designed to handle the effect, but the individual modes do help to find a near appropriate type. WARNING: The ROM features flickering colours that may cause eye strain, and may not be suitable for anyone with past/known symptoms of seizures\epilepsy. Download You will need a 6-button controller for this, as X, Y, Z and MODE buttons control the effect in various ways. This list is as follows: MODE = 3D mode (00 Off, 01 Frame, 02 Scanline) Y = Distance mode (00 Normal, 01 FG Stretch, 02 Reverse, 03 Reverse & FG Stretch) X = Red colour (00 Filter, 01 Push, 02 Bright) Z = Cyan colour (00 - Filter (Blue), 01 - Pushed (Blue), 02 - Filter (Cyan), 03 - Dark (Cyan), 04 - Darker (Cyan), 05 - Pushed (Cyan)) Each level has different varients of colour, so the effect may need adjusting depending on the level's colour. I must also point out that "3D mode" will be 00 Off by default, which will do nothing obviously. I find the effect works sometimes in some places, but not all the time. It can also depend on how far away from the screen you are standing/sitting, as Flygon noted in one of the tests, he had his back against the wall of his room being really distant from the screen. While I on the other hand, found being up reasonably close helped, so be sure to try looking at the screen at different distances. I also found that where you focus can have an effect on the 3D display. For example, in GHZ if you look at the background directly, it tends not to work, there as if you are standing on a platform object, and focusing on Sonic and the platform itself, the effect becomes a little more noticable. Other things that may effect the visuals include the type of TV screen and hardware/simulator you run the game on. Flygon reported spots of colour bleeding on a CRT screen. The region frequency is another thing to note, 60hz and 50hz may have different visual results, and you might get more flickering on the 50hz PAL mode. Another note about flickering, lag in a few possible places can cause this, especially on 02 Scanline MODE, so please keep that in mind. LazloPsylus and I have gone through each level checking out various modes, and our recommended modes are: GHZ 0 2 3 1 or 0 1 4 1 LZ 1 2 2 1 (When concertraighting on the background) or 0 2 2 1 (for a darker background) MZ 0 2 4 1 (OK for the grass area) 1 2 2 1 (best for the underground parts) SLZ 1 2 2 1 (Generally for the bottom part) SYZ/SBZ 1 2 2 1 We have found that 1 2 2 1 does generally work the best, with 0 2 3 1 being a darker version. 0 2 0 1 works quite well but is very dark, so you may have a tough time seeing it. What's really interesting, is that GHZ of all levels, was the one that didn't seem to turn out very well. It seems that levels with backgrounds that have very little parallaxing, and enough foreground coverage tend to work the best. A very special thanks to Flygon and LazloPsylus who did a fantastic job being my eyes while I didn't have the glasses until recently, the effect would not work as well as it does in most levels, without their assistance helping to tune it right.