If you buy the Artifact Detector you can find them easier.
A:Five artifacts
The math class in LEGO Indiana Jones is some where in a level at least that's what my cousin said. And the right level is in the last crusade and the level is rescue professor Jones :)
beat the first level.
By playing the first level of Temple of Doom you unlock him for free play.
complete the first level
Run and Jump
You beat all the levels find all the artifacts and minikits and you need to get true adventurer in every level. Buy everything. Also beat the bonus levels. Find the hidden Star Wars Characters.
peanut butter
nothing can helpyou with this task
If you get all the artifacts from one level, then you can go to a room where you have a bunch of minikit models, and you can scroll through them and see wich ones you've completed. That's how it is for DS
no you cant because each level leads to the next level after that
Yes and level builder.