Then, have Olmec do a "pounding" jump into the lava, sinking directly above the jetpack. To do so, you must carry a spare jetpack (which you can only do while wearing another jetpack) to the level, dig a hole to the lava, and sink the jetpack into the lava, giving it enough time to reach the bottom. It is possible to drain the lava under Olmec's Lair.If you do this, you will not take the chance of Olmec spawning monsters when pounding down into the lava. Then lure Olmec far enough away to allow yourself to dig a hole with 5 bombs. When using the 5-bomb-method to enter hell, it may be a good idea to let Olmec pound the ground above the hell entrance once.You will have a narrow margin of time to stand on him as you enter Hell before he drowns too deep, so you must stand on him at exactly the right time, while also taking care to avoid the Magma Men which spawn from the lava and can jump high enough to hurt you. Therefore, whichever strategy you pick to kill Olmec, you must ensure he drowns in the correct location (the Necronomicon will lead you to the correct vertical location by ticking as you get closer to it). Unlike regular exits, the Hell Entrance does not have a platform for you to stand on, so you must use Olmec as he drowns in lava as the platform. If you have the Necronomicon from the City of Gold and are planning to enter Hell, you will (in addition to killing Olmec) need to open a path to the Hell Entrance.There are multiple variations of this that require less time at the cost of a few resources, while bombs are not needed, the use of them makes the fight faster, which also reduces the chances of random monster spawns by Olmec.Repeat this crushing maneuver until Olmec crushes his own way into the Lava, making sure to dodge both Olmec and his spawns (use a rope to kill spawns falling on top of you). Run under Olmec during his jump, which will cause Olmec to crush the tiles under him. The more dangerous way requires no resources (although having a few ropes is highly recommended).To make a wider hole, either place the bombs at an edge between two tiles, or, after placing a bomb, quickly pick it up and place it again. When normally placed, a bomb will only dig a 3-tile wide hole, not wide enough for Olmec to fall through.Doing so will make Olmec do a "pounding" attack that will land him directly into the hole. Then, lure Olmec to the hole, standing very close to the edge opposite of Olmec (so close you are teetering over it). You will need a rope or jetpack to get back out, unless you use more bombs. In this case, simply drive Olmec to one corner of the map, and then use the bombs to dig a 4-tile wide vertical hole leading all the way to lava. The safest way is to possess 5 or more bombs in your inventory.
The only way to defeat Olmec is to drop him into the lava below the level. Doing this allows you drive Olmec to a convenient location, and also makes it easier to reach the upper platforms of the level, filled with treasure and crates (you will still need a rope or a jetpack to reach the upper levels, however). It is possible to "ride" Olmec by climbing on top of the head while it is on the ground, and standing close to one of the edges. These spawns appear as flying sparks which fly away in an arc from the crushed tiles, and will turn to enemies when reaching the ground again. While crushing tiles in this way, Olmec may also spawn lesser enemies such as Hawkmen and Frogs. This "pounding" jump destroys up to 5 tiles directly below him upon landing, crushing anything in the way (including the player). If Olmec's jump brought him directly above the player, he will freeze in the air for a fraction of a second, and then violently pound the ground under him. During "regular" jumps, Olmec does not spawn enemies or damage tiles. Olmec will follow the Spelunker by jumping towards your direction, assuming you are close enough.