Make your way to the right, killing frogs as you go. Jump across the platforms (avoid the one with spikes) and climb up the red plant to reach the upper platform. When you get there jump onto the block to the far left. Jump and slice the cracked block to reach the upper platform. Climb the vine and hack your way through the blocks to get the blaster--only destroy the bottom blocks! The blaster has unlimited ammo. Now jump and destroy the top-right block of the part you're in and climb up there. If you accidentally destroy the ones below it jump over to the vines then jump across again (a running jump is higher than a standing jump). Keep heading upwards. Destroy the bat/lizard and continue upwards. Head to the right.
The chess knight statue here is invulnerable and can shoot its blasts either straight ahead or diagonally. Head up and to the left, then to the right. Jump on top of the second knight and blast your way through. Destroy the snakes and make your way upwards. The spiked object on the right can shoot anywhere you are, but its shots are stopped by blocks. Make your way to the top, killing or avoiding enemies as necessary. When you reach the temple area be careful: there are two Stormtroopers here, and both use their guns now and then. When you reach the end Luke will go into the temple.
Head to the right. Make your way to the ladder and go up. Climb to the top of the right-hand ladder and time your jump onto the platform. When it reaches the end simply push 
to start climbing, then jump across to the other ladder. In the next room, destroy the probe droids and head up. In the next room is Darth Vader, again, and he has your friend, again. You revert to your saber for this battle. Hit him once and he turns into a sort of archaeopteryx. It flies around the ceiling, diving diagonally when you get lined up. To make it dive simply stand on a diagonal to it then move to what will be behind its landing spot, then stab it in the back. You can also use the saber bullet Force power.
After four hits collect the giant Force gem and head back to the first room. Use the flight power to navigate downwards and around the spikes. Head right and towards the barrier and it will open. Fire your blaster anywhere in the room to disable the forcefield (otherwise it kills you). At the end talk to Obi Wan, who adds himself to your Friends list.
Grab the Landspeeder and head right. This is much harder as there are lots of spiked blocks as well as enemy Landspeeders that will destroy you if they hit you. When you near the end there will be a large mound of breakable blocks. Crash into this and blast your way through for an extra life. After this the Millennium Falcon will take you to your next destination.
C-3PO contacts you. He is being held on Iscalon, the water planet. After the hyperspace jump you face yet another space battle. Beat this the same way as the first one.