Below are the 'original' games from Spain's oddball 1988-93 series, along with a couple of adapted US games/designs that I missed earlier.
Poco A Poco ("Little By Little") / El Nido ("The Nest"):The contestant selects one panel from each of three columns that correspond to a portion of the price of the prize (the first digit, middle three digits, three 000's at the end). Each panel contains a random cash amount. The contestant can either bail with the total cash amount revealed from the panels they selected, or risk the cash to win the prize if their selected panels form the price of the prize.
In early playings, the game was called El Nido and the contestant only selected panels from the first two columns.
La Escalera de Precios ("The Price Ladder"):The contestant must order five small items from least to most expensive. They get two chances, with the number of correctly-placed items revealed after the first chance. They win whatever small items they have in the correct places, plus the main prize if all five are correct.
Las Siete y Media ("Half Past Seven"):http://www.rtve.es/alacarta/videos/el-precio-justo/precio-justo-14-06-1988/5339768/This game seems to be inspired by Hit Me/Blackjack, only it doesn't appear to involve any pricing. The contestant spins the wheel on the left until they get themselves as close as they are comfortable to 7 1/2 without going over. Once they stop, the model spins the "Bank's" wheel on the right to try and beat the contestant's number (it appears the bank has to 'hold' if they reach 6). The number panels in the middle all contain prizes, and the contestant wins the prize corresponding to the number they have if they beat the "Bank".
El Gran Juego de Banesto ("The Great Game of Banesto"):This game, sponsored by Banesto, requires the contestant to use correct small item guesses to scale the money tower on the left. A car, worth less than the top cash amount, is also up for grabs.
The contestant is given a ball which they can trade in to continue if they get a small item wrong. When the contestant gets to the middle of the ladder, they can choose to play for the car on the second highest spot on the ladder and forgo the top cash amount. If they do this, they must guess which of the coloured panels on the right contains the picture of the car, then correctly guess the next small item to win the car.
Los Barcos ("The Ships"):The contestant must find the two panels that contain images relating to the main prize. They lose if they reveal water instead, but can win two extra lives through small items.
El Libreton BBV game (sorry, not sure on the actual name):This game, sponsored by El Libreton BBV, requires the contestant to stop the randomizer on numbers that correspond to the prizes at the bottom of the prop. They have ten chances to select numbers, so want to avoid landing on the same number more than once. If they land on one of the two sponsor panels, they can select any number (ideally one that's in the price of one of the better prizes).
La Gran Cazada de Leche Pascual ("The Great Pascual Milk Hunt"):Another sponsored game, the contestant must search in the prize (e.g. an actual car) for the letter blocks that make up the word 'PASCUAL' on the main prop. They win if they find all the blocks, which each correspond to a digit in the price of the prize. They can use small items, I think, to win wildcards if they cannot find one or two of the blocks within the time limit.
As De Copas:Unfortunately the video that had this game on Youtube seems to have disappeared and I can't remember how it is played. I'm thinking they had to match panels similar to Matchmaker (which Spain played in the first season), but with a small item element to earn more chances.
Juego De Los Piratas ("Pirates Game"):The first of three games played on a video screen, this one requires the contestant to guess the fourth, third and second digits of the prize's price from three choices each. They can have up to two wrong guesses.
Juego De La Aventura Jurasica ("Jurassic Adventure Game"):Another game played on a video screen. The contestant has to guess the first three digits, with up to four wrong guesses allowed.
Juego Del Faraón ("Pharaoh Game"):The third game played on a video screen, the contestant selects the number on each row that, when combined with the correct numbers on the other two rows, forms the price of the prize.
La Escalera de Prémios ("The Prize Ladder"):This was played in every episode as a consolation game for the contestants who didn't make it out of contestant's row, slotting in between the last pricing game and the secret one bid playoffs. The contestants have up to five cards drawn from a deck to try and win some cash. They have to guess whether the next card is higher or lower than the previous card. If they are correct, they can continue; if not, they lose half the amount earned and stop. There was a jackpot they could win for getting all five cards drawn.
While I'm at it, here's a couple of other games from this series that I missed the first time around.
Now Or Then:Take Two:Squeeze Play (1988 prop):Punch A Bunch (second 1988 prop):