Instruction:
STEP 1: Extract OpenLara.nacp and OpenLara.nro from the archive into "/switch/OpenLara/" on your microSD card
for original PC, PSX and Sega Saturn CD version owners
    copy data from your CD into /switch/OpenLara/
    (! to extract content from PSX CD images please use this tool https://github.com/m35/jpsxdec !)
for ported android version owners
    unzip data file /sdcard/obb/com.squareenix.tombraider1classic/main.42.com.squareenix.tombraider1classic.obb into /switch/OpenLara/
for Steam/GOG version owners
    go to ..\Steam\steamapps\common\Tomb Raider (I)\ and run dosbox.exe
    enter these commands
        mount C .
        imgmount d ".\game.dat" -t iso -fs iso
        xcopy D:\DATA\ C:\DATA\
    after that you'll get level files in the new "DATA" folder copy them into /switch/OpenLara/
for advanced users
    copy level and title screen files (PHD, PSX, PCX, PNG, RAW, SAT, SAD, SPR, SND, BIN) into "/switch/OpenLara/level/1/"
    copy audiotrack files (track_*.ogg, track_*.mp3) into "/switch/OpenLara/audio/1/"
STEP 2: Open switchbrew hbmenu (Album app) and run OpenLara

To switch into two players mode hold L and R buttons on both joy-cons.
Clicking on the sticks mapped as Start button and used to respawn your player to the position of another.
Hold L and R buttons on the one of joy-cons to switch back to single player mode.

Feedback:
    bug reports : https://github.com/XProger/OpenLara/issues
    questions   : https://www.facebook.com/OpenLaraTR
