If you can't remember your password, just go to https://www.mundo-ticket.com/en/auth/login and click on "Esqueci a senha" (Forgot password).
A password reset e-mail will be sent to your registered e-mail address on the platform.
If you do not receive the e-mail, contact the Customer Service at atendimento@gamescomlatam.zendesk.com
If you don't remember the email you used to register on the site, send an email to atendimento@gamescomlatam.zendesk.com