Item Combos 
Acetic Anhydride + Acetyl Acid = Aspirin 
Beryl Knife + Basalt = Magnetite/Jade /Augite 
Beryl knife + Calcite = Limestone/Marble 
Beryl knife + Gabro = Magnetite/Titanium Ore/Apatite 
Beryl Knife + Granite = Orthoclase/Quartz 
Beryl knife + Opiment = Yellow Paint 
Deep Sea Water + Mega-ade 1000 = Mega-ade 2000 
Deep Sea Water + Mega-ade 2000 = Mega-ade 4000 
Deep Sea Water + Mega-ade 4000 = Mega-ade 8000 
Deep Sea Water + Mega-ade 500 = Mega-ade 1000 
Deep Sea Water + Tourmaline = Mineral Water 
Diamond Knife + Calcedony = Carnelian/Sardonyx/Chrysoprase 
Diamond Knife + Corundum = Ruby/Sapphire 
Diamond Knife + Quartz = Citrine/Crystal /? 
Limestone + Gabro = Cement 
Mineral Water + Mega-ade 2000 = Supertonic Turbo 
Mineral Water + Mega-ade 4000 = Supertonic Extra 
Negative Ion Water + Mega-ade 1000 = Supertonic Dash 
Negative Ion Water + Mega-ade 4000 = Royal Ampoule 
Negative Ion Water + Mega-ade 500 = Supertonic 
Ring + Tourmaline = Ion Ring 
Snake Bite + Killer Spider = Scorpions Tail 
Titanium Alloy + Rebreather 10 = Infinite Rebreather 
Vanadium + Titanium Ore = Titanium Alloy 
Water + Mega-ade 300 = Mega-ade 500 
Water + Mega-ade 500 = Mega-ade 1000 
Water + Oxidized Alcohol = Disinfection Liquid 
Water + Tourmaline = Negative Ion Water 

Get Unlimited Rebreather 
First get titanium alloy by combining Vanadium + Titanium Ore. 
Now combine Titanium Alloy + rebreather 10 to get Unlimited Rebreather

Extra Fish
Once you build an aquarium go to your marine guide then Rearrange them in 
alphabetical order. Now when you go to the aquarium and do exchange you can 
see fish you've never seen before.

After the aquarium is built, you can fill it with fish that you have not yet 
photographed. For this to work, you should already have about thirty photos of 
fish. When you go into the menu to view stats on a fish, select all the different 
ways to alphabetize the list. After you have done this several times, choose which 
fish you want to populate your aquarium with. When you select a fish, a different 
fish that you may not have even seen yet should appear on the list, instead of the 
one you picked. Put that fish in the aquarium and view it. Try every different way 
to alphabetize the list until you get the correct one. There are some fish that this 
trick does not seem to work on, however it does work for a great number of them.