Repton is a classic Digging Game written by Tim Tyler in 1985 for the BBC Micro. The eponymous protagonist finds himself, for no discernible reason, in a maze filled with diamonds, all of which must be collected to complete each level. Obstacles to doing this include falling rocks, reptilian monsters and the ever-present time limit.The first game was followed by two numbered sequels, three Mission Pack Sequels for Repton 3, and a final game titled Repton Infinity because it included an editor allowing you to reprogram the way objects behaved, essentially allowing the creation of entirely new games. Each subsequent game added to the basic format new objects and obstacles, the most important being "spirits" that follow the walls and have to be guided into a cage (and often into a particular cage, working out which being one of the level's puzzles). Repton 3 is the most popular game of the series, as it strikes just the right balance in terms of bite-sized puzzles and variety of obstacles, and also allows the character sprites to be redesigned. Many of the Mission Pack Sequels take advantage of this by placing Repton in a completely different setting, ranging from the American West to the far future.Beginning in 2003, the games (so far not including Infinity) have been re-released for the PC by Superior Interactive, together with the Expansion PackRepton Spectacular and a forthcoming further expansion, Repton Extravaganza. An additional BBC Micro game, Repton: The Lost Realms, originally written in 1988 and lost, was rediscovered in 2008 and published in 2010.
The BBC Micro original has no savepoints or passwords at all, and is thus the only game of the series that requires completion in one sitting.
The PC remake adds a savepoint to the Hub Level. Most levels return you to the hub once completed; the exceptions are Levels 15—20, which must be completed in a chain, with only one savepoint, at the start of Level 17.
Critical Annoyance: Repton 3 flashes the screen to warn you when the timer falls below 15 seconds.
Difficulty Spike: "Giant clam" in the first game; the second level of "Finale" in Repton 3.
Endless Game: The original BBC Micro versions of Repton and Repton 2 looped after completion, although you did get a congratulatory message. Averted in the PC remakes (and in all other games of the series).
Fake Difficulty: The "Oceans" scenario represents diamonds as pearls in shells, and skulls (deadly on collision) as empty shells, so they require care to tell apart. Safes are hidden pearls, making them invisible until a key (torch) is collected. And then there's the "Future" scenario, in which blank space looks like earth (representing space dust) and skulls look like blank space (representing the deadly vacuum of space).
The fungus in Repton 3 can grow to cover entire levels unless you keep it contained.
The Lost Realms takes it further: each level has a hidden "fungus speed" variable ranging from 0 to 7. Speed 0 is so fast that the fungus can grow to flood the level in seconds!
Guide Dang It: The "Repton shuffle", stepping aside from under a rock and immediately pressing the opposite horizontal direction so you push it in mid-fall. There's no hint of this being possible before you reach the first puzzle requiring it. (Still, it's possible to reach the solution on a "when you have eliminated the impossible" basis.) The Superior Interactive re-releases have slightly different gameplay; in particular, on the remakes of Repton 1 and 2 (but not 3) you aren't killed by an egg landing on you, a fact it's important to know for some puzzles (which can be disconcerting for those familiar with the original versions).
Hammer Space: Repton can pick up and carry around up to 624 diamonds.
Hub Level: On Repton 2, all levels except the last two are accessed via transporters on the first level. In the PC remake, additional scenarios often have more complex structures, but having one or more hub levels is still common.
100% Completion: The first game awards a point for each earth square you dig, so to get the maximum score you must dig as much as possible. The second game requires digging all the earth.
Instant-Win Condition: On the first game, collecting the last diamond is this. Even if it's in an inescapable trap. In fact, this is sometimes used deliberately to force a particular diamond to be the last to be collected. Repton 3 averts this trope by adding the timebomb as a Level Goal. The Lost Realms reinstates it by allowing multiple timebombs, so defusing the last timebomb is now an Instant-Win Condition.
Invisible Block: Three scenarios make the safes invisible; fortunately, this only lasts until you collect a key.
Marathon Level: The last level of "Work" is the longest level of Repton 3. Connecting one cage requires shunting a large number of rocks, with spirits going round the level the whole time that have to be dodged and waited for. When SentinelProxima completed this in under 4:00, commenters said that it typically takes them twice or three times as long.
But that pales in comparison with the longest level of Repton Infinity, RobboB Level 1. This level is a maze of grass that has to be gradually mowed away, with objects stuck in the grass that have to be carefully freed and transported. Even SentinelProxima took twenty-three minutes to complete this one.
Musical Theme Naming: The level sets of Repton 3 are titled Prelude, Toccata and Finale. Those of The Lost Realms are named after tempo markings: Largo, Adagio, Allegro, Presto, with the faster tempi corresponding to harder levels.
Speedrun: The PC re-releases of Repton 2 and Repton 3 have an on-line high score list for the best speedrunners.
Stopped Numbering Sequels: The fourth game is Around the World. There are two different Repton 4s (plus The Lost Realms, which had Repton 4 as a working title), after which numbers were abandoned entirely since no-one could agree on what came next.
Tele-Frag: Avoiding this (by clearing the destination squares of transporters) is a common puzzle element in Repton 3. Averted in The Lost Realms, where transporting into an occupied square just removes its contents without killing you.
Teleporters and Transporters: Introduced in Repton 2 as the means of getting from the Hub Level to other levels and back. Repton 3 and The Lost Realms retain transporters, but now they take you from one location to another within a level.
Theme Naming: The levels of the first game are all named after reptiles and molluscs.
There Is Another: Collecting a key opens all the safes on a level, so a second key has no effect, and so there will usually only be one. However, sometimes (e.g. the fourth level of "Encore") there will be an unobtainable key early on as a Red Herring, and There Is Another later in the level.
Unwinnable: Repton 2 if some of the sub-levels are tackled in the wrong order, or if you overlook a diamond before transporting out of a level, since each can only be accessed once. This being a Puzzle Game and all, all the games can be rendered Unwinnable if you fail to solve the puzzles, but on the other games at least you need only restart from the beginning of the level.
Unwinnable by Mistake: The first release of Repton 2 required collection of one more diamond than actually existed.