How to change Difficulty and Rounds

1) In the start menu, go to Options

2) Choose the 2nd menu, next to Key config menu

3) the last 2 options are the Difficulty (対戦CPU思考) and the number of rounds (勝敗本数) respectively. 
    By default, the difficulty is on Normal (ふつう): pressing the left arrow switches to Easy (かんたん), pressing 
    the right arrow switches to Hard (むずかしい).

    By default, the number of rounds is 2 (２本制); pressing the left arrow switches to 1 round.

Thanks to Jeebee_Games for the translation!

How to start the endless mode

In the game menu select エンドレスモード (endless), then choose 通常エンドレス (normal endless).

Thanks to Jeebee_Games for the translation.

RetroArch configuration

1) download the latest version of RetroArch from [the official site](https://www.retroarch.com/?page=platforms), you can choose between Installer version or Portable version, personally I prefer the portable

2) you need PS1 bios files at this point

3) put those files in the System folder that is located in Retroarch main folder

4) open retroarch.exe and go to Load Core->Download a Core and from the list press enter on Sony - PlayStation (Beetle PSX HW)

5) to launch the game drag and drop .cue file of your GunPey image file (is recommended to use bin/cue image format for RetroArch) in RetroArch window OR go to Load Content and go to your image location.

6) Once the game is loaded, press F1 to go to core configuration and set as [there](https://www.speedrun.com/demolition_racer/thread/ptcz1) mandatory settings. Other things are customizable.

7) go to the top of this menu and press enter (or left click) on the name of your iso (above Renderer setting) to save your configuration. Press F1 to exit from the menu. You can press F to play fullscreen now.

I've done also a videoguide: [Download and configuration](https://youtu.be/CZPtQwrP6mQ) and [Advanced settings](https://youtu.be/doC0FUqR7UA)

Nombre	Autor
How to change Difficulty and Rounds	AQLGamers 5 years ago
How to start the endless mode	AQLGamers 5 years ago
RetroArch configuration	AQLGamers 4 years ago