The quest mode is where the player unlocks most of the game's weapons and perks. The player has to survive as long as they can while wave after wave of enemies appear at an increasing rate. All perks, weapons, and bonuses that have been unlocked are available in this game mode. The player is equipped with the AK47 rifle as monsters and spiders make their way towards the player from the left and right sides of the screen respectively. This mode does not have perks or bonuses. The player does not have a weapon in this game mode. Instead, the player needs to pick up bonuses to eliminate the enemies. This mode does not have perks or any point-based bonuses. The player only has the bullets found in the weapon he picks up, there are no reloads. Weapons are randomly dropped throughout the map. Like survival mode but everything is increased. The monster count is increased to make the play time much shorter than in Survival mode. All perks, weapons, and bonuses that have been unlocked are available in this game mode. Gembine is a hidden game within Crimsonland. The game is very similar to the puzzle game "2048". The player is presented with a 4x4 grid and using the arrow keys, the goal is the combine the gems to create larger gems. With each combination of a gem, the player receives points. To play the game, the credits from the main menu have to be selected and typed as "gembine" with the keyboard. Originally developed by 10tons Entertainment and released as freeware/demo version, in 2003 a commercial shareware version with publisher Reflexive Entertainment followed. The game was re-released and self-published through digital distribution in 2014 with updates to graphics, perks, weapons, enemies, and game modes. In 2015 it was released for the Xbox One. On November 24, 2017, the game was released on Nintendo Switch. The general reception has been fairly positive. On Steam, the user reviews have Crimsonland rated as "Very Positive" and a 4.5 out of 5 from TouchArcade. IGN gave Crimsonland a 7.5 out of 10. Meanwhile, Metacritic has Crimsonland at 68 for PC and 64 on the PlayStation 4 and PlayStation Vita.