You can participate with any type of bicycle, the first to arrive will win. We recommend a Gravel or Off-Road bike with 700x32c to 700x40c cyclocross tires, since not all sections are in optimal condition. We also recommend a 1 to 1 ratio, for example 50-34 forward and 34-11 reverse. We do not recommend using a single chainring to make the most of the descents.
As for the equipment, we can recommend a front bag and a rear bag at least.
You can see the mandatory material in the race regulations.