The bonus level is called "All Hallows". Below, you can find the basic info about each level-number of save/power up crystals ,number of secrets, size and other stuff such as enemies, items and puzzles.
India1.Jungle
2.Temple Ruins
3.River Ganges
4.Caves of Caliya
Nevada
5.Nevada Desert
6.High Security Compound
7.Area 51
London
8.Thames Warf
9.Aldwych
10.Lud's Gate
11.City
South Pacific Islands
12.Coastal Village
13.Crash Site
14.Madubu Gorge
15.Temple of Puna
Antarctica
16.Antarctica
17.R-X Tech Mines
18.Lost City of Tinnos
19.Meteorite Cavern
Bonus Level
20.All Hallows
1.Jungle:That's an easy level with 6 secrets and 6 save/power up crystals. Be careful: There are lots of spikes and monkeys that like to steal your medipacks.
2.Temple Ruins:This level is huge. You have to find the five Ganesha keys. Nearly every mission to find a key is a small level itself. Have fun with the armed statues that come to life and with the deadly spike traps. Get used to pulling blocks and escaping from boulders. You'll encounter timed switches and invisible platforms. This level has 4 secrets and 8 save/power up crystals.
3.The River Ganges: You'll have a nice time with the quadbike. Get used to the controls because in some places, you have to control the quadbike very well, if you don't want to end up in a river with piranhas. Take care of the crows that attack you from the sky. If you don't want all the secrets, this level will be quite small and easy, but less challenging. This level has 5 secrets and 6 save/power up crystals.
4.Caves of Caliya:This is a boss level that has no secrets .It's a little frustrating to find your way out of the cave, it is really a labyrinth, but the boss enemy is very easy to defeat. This level has 2 health/power up crystals. Click here for tips on how to defeat Tony and retrieve the Infada Stone.
5.Nevada Desert:This is a pretty neat level neither large nor small. It has 3 secrets and 3 save/power up crystals. You can do a lot of exploring near a waterfall and find a way to use the quadbike to enter the High Security Compound. Be careful-there's an the electric fence and also, small snakes that hide in the bushes.
6.High Security Compound:You start this level without your weapons. The Military Police Officers were kind enough to leave a small medipack for you. They didn't however notice the Infada Stone or the other artifacts you had collected so far... Anyway, in this level, you have to move quietly and try to avoid being seen .You should free the prisoners and let them finish off the MPs. This level is quite big and in my opinion, it gets boring somewhere. It has 2 secrets and 3 save/power up crystals.
7.Area 51:This level is big but awesome and very challenging. Lots of baddies, tricky timed traps and puzzles, lots of different keys to collect- and you even get the chance to see a rocket departing. It has 3 secrets and 4 save/power up crystals. You can retrieve the Ora Dagger there.
8.Thames Warf:This level is very dark, so you really need to have conserved enough flares from the previous levels. There are many switches and many baddies around and things are a bit too complicated, but it is still a nice level. It has 5 secrets and 8 save/power up crystals.
9.Aldwych:This is probably the hardest Tomb Raider level to date and that's because the puzzles are too complicated, the areas too many and it is difficult to get oriented. The are many bugs-the infamous drill bug for example, that may prevent you from proceeding into the game. You have to use your skills to beat the timed sequences and to avoid the trains that pop up in front of you while you are quietly walking among the railways. But you also need to use your brains to open the doors in the switch room. It is quite difficult to find where each item you find has to be used. This level is very big and has 9 save/power up crystals and 5 secrets.
10.Lud's Gate:The secrets are very difficult to find in this particular level, which is very big. The puzzles are not very hard, when you are not searching for the secrets, but you have to use your battling skills underwater to escape from crocodiles and scuba divers. You can use the underwater propulsion unit there. This level has 11 save/power up crystals and 6 secrets.
11.City:This level is a boss one-you have to defeat Miss Sophia Leigh and get the Eye of Isis Artifact. Click here for tips on how to defeat her. There are no save/power up crystals in this level and there is only one secret.
12.Coastal Village:This level doesn't have anything special. It is medium sized, quite easy and without many challenges. You'll get the chance to explore a village. You should take care of the tribesmen. This level has secrets 3 and 5 save/power up crystals.
13.Crash Site:This level is hard, because of the enemies. You have to conserve ammo for this particular level, because you'll be facing a bunch of raptors and a mean T-Rex and also some little green dinosaurs. There are some puzzles that are quite hard to solve. This level is quite big and has 3 secrets and 4 save/power up crystals.
14.Madubu Gorge:Here you get the chance to use a kayak to paddle down the river. I warn you: don't try to dive into the river because you'll soon be dead. It is a medium sized level with some tricky points and places where you have to use your skills underwater to escape from blood-thirsty crocodiles. This level has 3 secrets and 8 save/power up crystals.
15.Temple of Puna:This is probably the best boss level in the game It's not just "pull 2 switches and face the boss". You have to escape from boulders and spikes and get those brains to work trying to solve the rolling blades room puzzle. Then you'll be able to face Puna. Click here for help with him.He'll leave the Element 115 for you. There are 2 save/power up crystals and only one secret in this level.
16.Antarctica:This level is quite big, has a tricky timed puzzle and takes place in a large area. You can explore a ship, use a boat and also, find a crowbar for the first time in the Tomb Raider History. You'll finally make it to Dr. Willard's office. The water is freezing cold, and if you dive into it, you won't live for much longer. This level has 3 secrets and 4 save/power up crystals.
17.R-X Tech Mines:This level is quite large and awesome. You have to fight against small and giant mutants and collect the appropriate items to proceed into the excavation site and exit to the next level. You have to get used to driving a mine cart- that's really a challenge. This level has 3 secrets and 5 save/power up crystals.
18.The Lost City of Tinnos:This level is huge. In order to proceed, you need to get 5 artifacts-4 Oceanic Masks and the Uli Key. Each mission for an item is a small level itself. Press the right switches to lower and raise platforms, escape from underwater hazards, swim quickly until you find an opening, time your jumps well and land on the invisible platforms, avoid the fire...These are few of the challenges this level has. And of course, you have the Alien Warriors and the Alien Flies messing up with you. This level has 5 save/power up crystals and 3 secrets.
19.Meteorite Cavern:That's right, this is the final level. The boss enemy is Willard himself who has transformed into a giant mutant spider. What you have to do is kill Willard and retrieve the 4 artifacts he's stolen from you. Click here for help with him. There are no secrets or save crystals in this level.
20.All Hallows:This is the bonus level you've been collecting the secrets for. Now, is it or isn't it worth the effort? You decide. It is short and has only two enemies-a baddie and his dog. Just be sure not to lose much energy at first because ...(oh, well, I won't spoil anything).In fact, you'll play this level before the level Meteorite Cavern.