Endless mode is similar to regular campaign, but there are some differences. Titan genus appear on endless mode if one of two possibles conditions are reached : either having a particular technology or being at an advanced enough level will make them appear. It allows you to manipulate somewhat their appearance. There are not Boss Titans in endless mode. It is possible to research all 73 technologies in endless mode, but the difficulty of the 73th and higher level is almost insane. Keep in mind only up to 9 powerups is possible to keep in stock. Any powerup above 9 is wasted. No money for medal on the end of level is obtained. If hoarded above 50000$ to bank, there will be only one small crystal in the next level.