The game is a pathing tower defense game, with guns placed to shoot enemies and guide them to the exit or exits. As well as the features expected in such a game it has two unique features.rnTunnels: All forty missions include tunnels which greatly increase the strategic component of the gameplay, making no two missions the same. Some tunnels help the bugs, and need to be blocked, some can be used to make bugs take longer routes, some can be used as bottlenecks to funnel bugs past guns. Later in the game the player can add extra tunnels, increasing the strategic possibility and replayability.rnEditor: A full editor is included in the game, able to create any of the levels in the game, with additional graphical options not seen in the main game. Currently the editor is unlocked on completing the main game but this could be changed to e.g. only worked on one site. GamerSafe's LevelVault is used to store levels, with an in-game level browser.rnOther features include:rnrnfive bug types, five gun types with bosses and gun levelsrnupgrades and achievementsrnmusic and stereo soundrnmultiple in-game branding opportunitiesrna tutorialrnin-game helprnsmall size (2.3 MB)rnrnThe game is played with the mouse, but the following keyboard shortcuts are also availablernrn1-6: choose a tower or (later levels) wallrnN: place a selected flower or wall under the cursorrnU: upgrade the selected towerrnS: sell the selected towerrnW: Send the next wave earlyrnX: (when paused) exit the gamernM: Mute and change the sound effect volume rnK: Toggle the musicrnrnThe unlock button on the main screen can be used to access all levels and features, including the editor and level browser, for testing; it will be removed before release. Saving (except for user created levels) is disabled if this button is used until the game is reloaded.