Green is easy peasy.
Blue which is an extra few KM on the Green rather than a standalone trail is harder, long, fairly steep climb for little legs.
Red is long, but not very hard, it’s 90% fire road, it’s actually my favourite climb if there is such a thing, it’s long, but easy climb, 2 descents, long but easy climb, few descents, nasty but short switch-back climb, couple of descents, short, slightly steeper fire road climb, 3 awesome descents, followed by a bit of fire road back to the car park.
Black, I’ve only ridden it twice but I wasn’t a fan, it’s like one of those optical illusions where you climb a lot further than you descend, it’s also almost unimaginably steep in parts, like a granny and the biggest on the back isn’t low enough steep.
NB, the Red is in a different car-park / village to the rest of them.