Boxes is a minimalist puzzle game about rearranging boxes. Seemingly simple yet tricky to master, organise your way through 30 increasingly complex levels.

Boxes is a sliding blocks puzzle game inspired by minimalist mobile games. The game is slower-paced, but more challenging, than its competitors in the genre.

Players are required to think for slightly longer about their moves, particularly when new mechanics are added to what is otherwise a very straightforward premise - move the coloured boxes towards the wall of the same colour.

Boxes was developed independently over the course of a week as part of ‘The Neighbourhood’ game jam, using Construct 3.

Case study - mobile game design

Boxes may have been made as part of a game jam, but I’d been wanted to make such a game for some time. I have a deep appreciation for ‘casual’ mobile puzzle games - the kind that hook you in and keep you playing even after your commute is over.

Take the popular mobile game Two Dots as an example. The premise is simple - connect two or more dots of the same colour to remove them from the grid. Connecting four or more dots into a square removes all of the dots of that colour from the grid.

Each level has different goals - ‘remove 60 blue dots’ is a basic example. The traditional mobile game staples - such as lives, an overworld progression system, and three-star grading on completing a level - are all present.

I’ve completed almost 1000 levels of Two Dots, but I keep coming playing because of three things:

  • New mechanics are introduced at regular intervals to freshen up gameplay. Anchors can only be removed by reaching the bottom of the grid. Nesting dots have to be ticked down by matching dots in adjacent spaces. Some dots are on fire, which spreads rapidly and is only destroyed when adjacent dots are removed.

  • The game feels good to play. Connected dots disperse with subtle fade, and new dots fill the now vacant spaces with a weighty thud. Creating a square causes all the dots of that colour to light up before the move is confirmed. The various power-ups and mechanics add further colour and flair.

  • The game’s progression system is fine-tuned to deliver consistent motivation to the player. Beating levels moves the player further along the overworld map. Completing 25 levels unlocks a new area, reflected by new background illustrations, which meld together into an attractive diorama. Completing each area also unlocks a charming postcard. Wish you were here.

Two Dots does have its flaws. Difficulty is often derived from the randomness with which new dots enter the grid, rather than complex level design. The ceiling for player ability is very low; you don’t necessarily ‘improve’ at Two Dots, you just keep playing Two Dots.

Of course, this last point is a staple of mobile games that have mass-market appeal - they aren’t overly taxing. I set out to make a game that carried more of a cognitive challenge to players, whilst retaining the other factors that make simple puzzle games so successful:

  • Simple ruleset. All boxes of the same colour move at the same time. Boxes always move towards the wall of the same colour. To complete a level, all boxes need to be touching the wall of their colour. Once a box touches the wall, it cannot be moved again.

  • Mechanical depth. Although the basic premise is simple, additional mechanics add complexity to the puzzles. For example, in later levels there are boxes can be moved in two directions. New mechanics should be introduced at intervals, just as the player has begun to develop mastery over the existing gameplay, so as to keep players interested.

  • Bright, minimalist graphics. Important from a design as well as an aesthetic perspective. Colours and shapes are often used as the moving pieces in mobile puzzle games as they’re a universally recognisable ‘vocabulary’; players don’t need to learn a new game-specific langugage in order to play. This streamlines the onboarding experience, particularly for casual players who don’t play many games. Bright colours are also naturally engaging, drawing players to the game.

  • Satisfying feedback. Pay attention to game feel. Use graphical effects and sounds to let the player know they’re doing a good job. Should not be limited to completing the puzzle, but to all aspects of interacting with the game - moving pieces, touching walls, rewinding, etc. Heighten the sense of ‘delight’ in the player and they’ll keep playing for longer.

  • Scalable. It’s easy to extend the playtime of the game, by adding in new levels with new mechanics, even after the game has been published. There is also scope to add monetisation, such as purchasable power-ups that make clearing levels easier - e.g. a simple ‘next move’ hint, or a bomb to remove one of the boxes.