Widescreen

On each version of Evil Twin, you can hack the game to play fullscreen and enjoy a better field of view. If you play on an original Dreamcast, beware of high fps drops.

Dreamcast

On Dreamcast you need to edit with an hexa editor the track05.bin if you use a .gdi dump. Otherwise edit the .cdi disk. On Mac you can use the free Hex Fiend and HxD on Windows.

You just need to find & replace the following values.

Don't forget to configure the video output of your emulator to widescreen.

Find

ABAAAA3F 01D00B00 09000000 B03D1B8C

Replace

398EE33F 01D00B00 09000000 B03D1B8C

Replace

0B00F9FF 00000040 08B7198C

Remplacer

0B00F9FF 5555D53F 08B7198C

Find

D0000000 00000040 14A6198C 78AE198C

Replace

D0000000 5555D53F 14A6198C 78AE198C

Source : http://retro-magic.de/

Windows

This hack doesn't work anymore on Windows 10. It's too technical for me to figure out the reason why.

Do the same thing as described on the Dreamcast part. Edit fnx_core.dll inside the game folder.

Find

C9 7F 7F 9E C9 7F FF 80 02 00 00 E0 01 00 00 10 00

Replace

C9 7F 7F 9E C9 7F FF 90 06 00 00 1A 04 00 00 10 00

Now, configure the game to 640x480 video mode and you'll get 1680x1050.

Source : WSGF

Playstation 2

The easy one !
Download this file , drop-it inside the cheat_ws folder of PCSX2. Start the emulator, go to PCSX2 > Game Setting. Check Automatic Patchs.