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This article is a list of things.
This page lists stamps obtainable by playing System Defender. The stamps were first released on January 14, 2011, and there are currently 16 available.
|Ready For Duty||Finish G's tutorial||January 14, 2011||Easy|
|Garbage Disposal||Destroy 100 enemies in 1 level||Easy|
|Bug Overload||Protect the EPF mainframe from rogue bugs||Easy|
|Strategic Success||Destroy 100 enemies without upgrading cannons||Medium|
|Mono Mechanic||Complete a game with only one type of cannon||Medium|
|Tactical Pro||Destroy 100 enemies without taking damage||Medium|
|Master Mechanic||Fill every open socket with a cannon||Medium|
|Herbert Attacks||Complete the level 'Herbert Attacks||Medium|
|Klutzy Attack||Protect the EPF mainframe from Klutzy||Medium|
|Strategic Master||Destroy 250 enemies without upgrading||Hard|
|Tactical Ace||Destroy 250 enemies without taking damage||Hard|
|Test Bot Trio||Protect the EPF mainframe from the Test Bots||Hard|
|Protobot Attack||Protect the EPF mainframe from Ultimate Protobot||Hard|
|Track Herbert||Complete the Level 'Track Herbert'||August 18, 2011||Extreme|