KaleidoCards is a game system. It consists of a deck of 100 unique coloured cards which are used to play many varied abstract games which are quick to learn and play. The cards use five 'colours’: Red, Blue, Green, Black and White. Each card has three ‘aspects’: Word, Background and Font Colour. The Word is the name of one of the five colours, the Background of the card is one of the colours, and Font that the word is written in is also one of the colours. KaleidoCards comes with rules for 7 different games and the KaleidoSpeed Challenge: • KaleidoShout - a fast and loud trading game; 4-5 players; 2-3 minutes. • KaleidoClash - a fast-paced game of frantically grabbing cards; 2-8 players; 2-3 minutes. • KaleidoLine - a turn-based game where players play tactically to get rid of all their cards; 2-8 players; 5-10 minutes. • KaleidoCry - a quick colour perception game where players call out which colour appears most among multiple cards; 2-8 players; 10-15 minutes. • KaleidoSeek - a thought-provoking deduction game; 2-8 players; 5-15 minutes. • KaleidoCombo - a mind-bending perception game where players look for pairs of cards which make a 'combo' of all five colours; 2-8 players; 10-15 minutes. • KaleidoGrid - a cooperative or solitaire puzzle game of placing cards strategically to score points; 1 or more players; 5-10 minutes. • The KaleidoSpeed Challenge - a colour perception speed challenge influenced by the pyschological 'Stroop Test'; 1 or more players; 1 minute/player. There are many other KaleidoGames which can be played with KaleidoCards, making it a very versatile game system. Only limited editions of KaleidoCards are currently available. Its due to be launched into mainstream distribution in 2020.