Can the Guiding Bolt spell be aimed at an invisible target?

Question

Most spells state that the target must be something you can see. for example the magic missile spell says:

Each dart hits a creature of your choice that you can see within range.

But recently I saw that the guiding bolt spell does not. It states this:

Make a ranged spell attack against the target.

I was wondering how this targeting works against invisible creatures.

Let's say we are in a closed of room with an enemy, they turn invisible and we have no idea where they are. We know he is still in range because the room is very small.

Can I cast guiding bolt and just say, "I target the invisible creature in this room"? Or do I actually need to know where they are?

Answer 1

When making a ranged spell attack, you follow the normal rules for making an attack, just as you would if trying to stab or shoot the target with a weapon.

This also means you apply the normal rules for trying to target an invisible creature:

When you attack a target that you can't see, you have disadvantage on the attack roll. This is true whether you're guessing the target's location or you're targeting a creature you can hear but not see. If the target isn't in the location you targeted, you automatically miss, but the DM typically just says that the attack missed, not whether you guessed the target's location correctly.

Specifically; if the target is completely hidden, you need to guess where it is and then roll with disadvantage, missing automatically if you failed to correctly guess the target’s location. If the target is just not visible, but you know where it is, you don't have to guess but still roll with disadvantage.