1. Start in a T-shaped hall, the — of the T is a building that I'll call "the marble church" / 5 stores in the | of the T / 1st right: another laser sight in a box / 1st left: crowbar in a box / 2nd right: nothing, hrope over you / 3rd right: use crowbar to enter, 1 SMP in a box / 2nd left: closed (you'll drop in from second floor) / from 3rd right climb up / jump to window for 1 SMP / hrope, go / jump to ledges / climb window / on the metal bridge / jump on brick wall to metal plate / RJA to ammo / back to metal plate / drop into closed store (2nd left): flares amd ammo / climb up / gears view / drop down to gears room.
2. Gears room: find ladder / climb up / climb left (move available from Last Revelation on: first timeI forgot where I was and I used an absurde backflip-roll-action jump turning right into air: it works, but it wasn't TR3) / release to slide on brick wall / junction.
3. Junction: direction opposite to the "2 winged lions window" first / RJ / jump to ledge / switch rope 3x / back to junction / RJA to wall and to to the "2 winged lions window" for UZI clips / jump ahead on ledge / switch rope 1x / stone wheel rolls (borrowed from Ankor Wat) / RJA to ladder to climb down to the floor of the gears room.
4. The gears room: climb where the stone wheel was / torches room / save the game /use crowbar to get Gold Coin: rats! sprint away / go to statue room / ammo and 1 SMP / use Gold Coin: open exit gate, the trapdoor in the gears room, the left gate in "the marble church" / drop into trapdoor / 2 ammo and Secret #1 out of 3 / enter left gate in marble church / the rigth gate in marble church is now closed: it protects Secret #3.
5. Find the pool / get ammo on your way (on the ground, near the 2nd lamp / pull up / ammo / amusing big head with laser eyes / save the game: one shoot = Lara dead / it's trivial: run to safe position, non in the water control room, the other side, crawl behind the box over the round trapdoor ammo / use revolver with laser sight to shoot both eyes / get Mars stone (stone 3/4 for the portal) / go to water control room / get Secret #2 out of 3 over the panel / dont't warry about the pin (you need a wheel to turn) / open the round trapdoor (orange side) / climb down / save the game.
6. Rats everywhere: avoid them going into water imediately at left / X-shaped pool, 1 SMP in a branch / small lateral tunnel in the central pit (fan works) / pull up / ammo / get the wheel for water control / back to water control room / wheel on pin / turn it / back to X pool /central pit, 2nd tunnel (fan stopped) / small air chamber with 1 LMP / another water control room / action to wheel: paired fans stopped / go to fans / follow the long tunnel / no return door / red ammo and the shotgun / save the game.
7. Kill the statue (pistols and sidejumping work well as usual: the underwater gate in the pool and the rigth gate in marble church are now open / UZI clips and 1 SMP un the statue base / exit through the exploded window / another SMP / drop /two-ways trip to Secret #3 out of 3 (you know where: rigth gate in marble church) / into pool / another SMP near the open underwater gate / get Venus stone (stone 4/4 for the portal) / marble pool (the same pool in the Garden of previous level) / save the game before pulling up / MOVIE.
8. Remember Lara speech: put the remaining 2 symbols on the gate quickly, before that... Boom! [this will be clear if you kill Larson: do it to learn it]. Thus: as soon as the movie ends, run behind the portal in safe potition, give up 1 LMP and the ammo in open air but get 2 ammo and 1 LMP behind the portal / run on the portal under Larson fire / action for stone 3/4, sideflip, action for stone 4/4 / wait under Larson fire [some 75% energy loss] / enter the portal (caution: spikes) / running jump twice to a trapdoor / slide / end level.