Cave Story/Last Cave

The normal Last Cave is fairly straightforward. Avoid the drips from the ceiling and shoot the critters that you pass. Avoid the spikes and red liquid.

The Hidden Last Cave
The Hidden Last Cave requires precise navigation with the Booster 2.0. Many places can be bypassed with a normal jump instead of a Booster jump, which is easier to control because it doesn't jerk.

When you enter, all of your weapons will be dropped to level 1.

With the Spur
Start charging the Spur as soon as you enter and aggravate the far critter so it jumps into the laser you're about to fire. Walk off over the water, boosting right as soon as you are in midair. Rapid-fire at the two critters. Begin charging again. Walk off the ledge and boost across the small pit. Boost across the long pit the same way. Walk right a bit to aggravate the hidden critters and shoot them. Rapid fire at the other two, which should be to your left. Walk-off boost to the left again and begin charging. Jump so you hit the ceiling and fire a max laser then boost right, through the spikes. Begin charging again, walk off the ledge, then boost right. Kill the exposed critter and the three hidden ones with lasers and power up any weapons with the experience capsule if you want. Walk off the ledge and boost right, ignoring the experience capsule.

Boost upward using the hearts as a guide then boost right slightly to land on the small platform. Jump onto the ledge on the far right and then jump onto the ledge to the left. From here, you have two choices: Jump between the spikes and tap-boost down then rapid-fire kill the Critter. Take some experience if you wish. Short hop then boost left and land on the ledge. (You will need to pull back a little) Walk off the ledge and boost left. Do this for the next two pits, then kill the Critter with rapid fire. Boost up then left between the spikes, pulling back to land on the ledge below. Walk off then boost left. If you wish to get the hearts, boost up through them, trying to save as much gas as possible, then boost left after you've fallen past the spikes. Just boost left at the first opportunity if you wish to skip them. (which is usually a better idea because of the precision required to get the hearts without hitting any spikes.)
 * Jump, then boost up and coast onto the ledge
 * Walk off and boost toward the hearts, then jump right, boost up and boost left onto the ledge.

Jump left into the depression in the wall then right over to the ledge. Jump and boost right between the spikes then tap boost up and then right, between the spikes, while falling. Stand on the lone block next to the spike bed. Walk off and boost right, then boost up then boost right. (this may take some practice) Collect the Heart then tap-boost down, then boost right into the opening. Walk off over the spikes, then boost up, then left. Jump over the spikes then up onto the ledge. Jump between the spikes onto the platform below. Do a short-hop and boost through the spikes. Jump and boost up then right. Jump between the spikes and carefully boost through the spikes, conserving fuel, then boost up past the third set of spikes then left, toward the experience capsule. Power up any weapons if you wish. Stand next to the spikes. Short hop, then boost right between the spikes and land on the platform. Kill the Critters then begin charging. Boost up and kill the Critter. Get onto the ledge that the Critter was on by splitting the boost into two or three boosts. Begin charging and get the first shot on the mini-boss with a max laser.

Mini Boss
The boss will jump, throw three blades at you then land, pause, and throw three more blades. Dodge his shots with the Booster and then hit him with any kind of spur lasers. You may open the chest if you like, but the item does nothing.

Home Stretch
Shoot the two Critters with a laser. Walk between each set of drops and boost through the last. Fire a laser at the top Critter. Jump and fire a laser down at the two that are hopping next to the ledge. Lure the rest one by one killing them with rapid fire or lasers. Begin charging. Kill the three Critters that are in sight from the ledge. Run left and stop at the two block wide opening between the Presses. Fire a laser at the other three Critters and optionally kill the Presses behind you. Walk off and boost past the two pits without stopping (to avoid the Presses.) Kill the two Critters coming at you and the Presses behind if you wish. Enter the door to the Balcony. There are two enraged Mimiga before the saving/healing shack which can be killed with a max laser.