Slide is a game in the same drawer-box series of card games as Line-it, published by Gigamic and distributed in UK by Hachette BoardGames. It's a filler-length game for 2-6 players designed by Claude Clément, with brightly-coloured art by Joey.
The game is played with a deck of 100 square cards numbered 1-10. Each player lays out a face-down 4 x 4 grid. Simultaneously, players all remove and flip a face-down card from anywhere on their grid and the card goes into a shared pool. Players then take turns taking one of these face-up cards and sliding it into their grid from any edge so that the gap is filled. Obviously the player who goes first gets a wider choice and the player who goes last has to just take whatever's left but that evens out over the course of the game because the first player marker rotates around the players. The game ends after 16 turns, by which time all the players' grids will entirely comprise face-up cards. You total up the value of the cards in your grid and the player with the lowest score wins.
You might think that this then is simply a game where you're always picking the lowest value card of those available to you but there is of course more to it than that because orthogonally adjacent cards of the same value all count as zero - so players will take cards with a high face value if they have a good prospect of being able to slide them next to a matching card: it's only the standalone numbers that will score... This means that it can be a perfectly valid strategy to pick the high cards eschewed by other players.
There are 10 copies of each card but not all the cards will be in play: in a six-player game you'll be playing with 96 cards but in a two-player game you'll only be using 32 cards so there's a distinct possibility that there could be cards that have no matching pair. It means that at lower player counts Slide has more of a push-your-luck element.
With virtually simultaneous play, Slide plays quickly; our games have run to only around 15-20 minutes even with a full complement of six players. Perhaps it's because the game reminds us of the sliding tile games we used to amuse ourselves with as children but this game has already slid into place as one of our 'go to' games night fillers. It can be fiddly picking up cards from the middle of your grid without jogging the other cards tho' so this is a game that's best played on a neoprene mat.