Start a game in single player mode and press TAB. Then, activate the following cheats by entering the corresponding codes. A new message will confirm correct code entry:

CHEAT FUNCTION - CHEAT CODE
$10,000,000 - zeropercentinterest
$100,000,000 - canyouspareadime ornomoneydown
Immediately research all regions - iseelondoniseefrance
10 of each type of resource - feelthatmojorising
All resources increase to 99 - idkfa
Direct Action Card - hitmeagain
Full set of Direct Action Cards - upmysleeve
Complete current research project - impressme